Devastating floods are almost annual occurrences in the West and in California. With the anticipated sea level rise and other impacts of a changing climate, particularly heavy winter rains, flood management is increasingly critical in California. Compounding the issue are man-made flood hazards such as levee stability and stormwater runoff.
Droughts and floods are both a part of life in California as 2017 has so clearly demonstrated: It took one of the wettest winters on record to pull the state from the depths of a five-year drought. The state has invested funds in bulking up drought and flood protection in the past, but recent events highlighted the necessity of rejuvenating those efforts.
In a state with such topsy-turvy weather as California, the ability of forecasters to peer into the vast expanse of the Pacific Ocean and accurately predict the arrival of storms is a must to improve water supply reliability and flood management planning.
The problem, according to Jeanine Jones, interstate resources manager with the state Department of Water Resources, is that “we have been managing with 20th century technology with respect to our ability to do weather forecasting.”
Sen. Jim Nielsen, Assemblyman James Gallagher, and members of the Oroville Dam Coalition are seeking federal assistance on issues relating to the dam they say need to be resolved. They met with commissioners of the Federal Energy Regulatory Commission and representatives for the U.S. Army Corps of Engineers, the U.S. Department of Transportation and the Federal Emergency Management Agency.
State Sen. Jim Nielsen, Assemblyman James Gallagher and Oroville Dam Coalition members are heading to Washington, D.C., this week to address what they say are outstanding issues following the spillway crisis.
The rains that swept into Northern California this weekend from the Gulf of Alaska didn’t turn out to be as extensive as forecasters had expected. … Work crews continue to repair the main spillway and emergency spillways at Oroville Dam in Butte County, which were heavily damaged in February during the massive atmospheric river storms that ended California’s five-year drought.
The Oroville Dam flood control spillway has been fixed. … In addition, [state Department of Water Resources Director Grant] Davis said “repairs and updates” are already being made at some of the 93 other dams around California where the state ordered intensive inspections in the wake of the Oroville crisis.
As California moves into rainy season, a growing number of voices are urging the state to explore getting out of federal flood insurance and creating its own program. … Among the loudest proponents of this small version of Calexit is Nicholas Pinter, a professor at UC Davis and associate director of its Center for Watershed Sciences.
Crews are laying the last layer of concrete on the Oroville Dam spillway with one day until the state Department of Water Resources’ deadline to have the structure ready to pass flows of 100,000 cubic-feet per second, or cfs.
Even living here on the West Coast, Marion Townsend decided to act as floods ravaged Texas and hurricanes pounded the Caribbean in recent weeks. Her Sacramento neighborhood slopes downward from a levee that separates it from the American River, in an area that officials concede never should have been settled but is home to 100,000 residents.
California needs to spend another $100 million a year to keep the state’s levee system sound, according to state flood control experts. At a press conference marking flood preparedness week Monday at a levee repair site near Sacramento, Bill Edgar, president of the Central Valley Flood Protection Board said the levees will need a $17 billion to $21 billion investment over the next 30 years to protect the seven million Californians at flood risk.
The state Department of Water Resources plans to clear mounds of rock from the Gold Rush days at the Oroville Wildlife Area and put them to use in the rebuilding of the spillways at Oroville Dam. DWR received approval from the Federal Energy Regulatory Commission, according to a filing made last week.
Trouble with the Upper Berryessa Creek flood project between North San Jose and Milpitas continues to work its way downstream, as a group of residents plan to legally challenge the Santa Clara Valley Water District and California Department of Fish and Wildlife in court over “unmitigated” environmental impacts from the Lower Berryessa Creek project.
The cost of repairing the crippling damage to Oroville Dam’s spillways caused by last winter’s fierce storms has almost doubled, state water officials said Thursday. … Jeff Petersen, project manager for Kiewit, said that once construction workers got on the site they discovered they had to dig much deeper to get down to bedrock than they had expected.
In one of the fastest-paced civic construction jobs in recent U.S. history, hundreds of carpenters, operating engineers and iron workers are rushing to complete repairs to the damaged Oroville Dam spillway. The crews are trying to beat a Nov. 1 deadline and the Northern California rainy season, which once again will begin to fill the massive reservoir behind the nation’s highest dam.
An unprecedented wave of destructive hurricanes has brought the long-struggling federal flood insurance program to the brink. Now Congress faces tough questions about whether to again bail out the nearly 50-year-old program and how to implement reforms to make it more sustainable, secure and cost-effective.
A plan has been prepared for flood control operations this rainy season at Oroville Dam, which call for keeping the lake lower and aggressively releasing water if the water level rises above trigger points. Up to now, the dam has been operated under rules drafted by the Army Corps of Engineers in 1970, which set a maximum lake surface elevation target of 848.5 feet above sea level for November through April, and 870.1 feet in May.
Local governments and nonprofits trying to recover from major disasters have sometimes learned the hard way that money spent on protective measures, cleanup and rebuilding is not always reimbursed by the U.S. government.
Thursday’s package, which the Senate could take up when it returns next week, includes money for Federal Emergency Management Agency’s nearly empty Disaster Relief Fund and for the financially-struggling National Flood Insurance Program.
Something monumental happened on August 25 in California water management that received almost no media attention: It became official policy to reconnect the state’s major rivers with their floodplains. The action by the Central Valley Flood Protection Board, an obscure panel appointed by the governor, clears the way for the state to embrace projects that allow floods to recharge groundwater. … The timing coincides with two other major state programs.
Next month three Marin Municipal Water District spillways will undergo an inspection to make sure they are safe in the wake of the Oroville Dam problems earlier this year. Last week the district hired Los Angeles-based AECOM to conduct evaluations of the spillways at the Kent, Nicasio and Soulajule reservoirs as required by the state Division of Safety of Dams.
As increasingly intense hurricanes batter the Southeast and the Caribbean, heightening some of the worst fears about a changing climate, California is facing its own threat of bigger and more destructive storms.
On Tuesday, the Board of Supervisors of the Water Resources Agency approved up to $500,000 for state-mandated emergency repair work to the county-owned Lake San Antonio and Lake Nacimiento dam spillways dubbed “minimum requirements” to allow the dam spillways to continue operating, with additional, classified assessments still being finalized that could result in further repairs.
After big natural disasters like Hurricanes Harvey and Irma, federal officials often tighten up flood protection standards. That’s what happened in California after Hurricane Katrina twelve years ago. But many flood-prone communities are still struggling to meet those standards, including Sacramento, one of the riskiest flood zones in the country.
The cities of San Francisco and Oakland are suing some of the world’s largest oil companies over climate change, joining an emerging legal effort to hold the fossil fuel industry accountable for the damages wrought by rising seas.
Right now, California may be dealing with more fire than flood, but there are still important lessons that the state can learn from Harvey and Irma, says Nicholas Pinter, the associate director of the Center for Watershed Sciences at the University of California, Davis. In fact, says Pinter, there are lessons that the Western United States should learn from flood management around the country, and the world.
State lawmakers responsible for the safety of residents downstream from Lake Oroville applaud the Department of Water Resources reconstruction to the dam’s damaged primary and emergency spillways, but the lawmakers still want answers and accountability for the cause of February’s near-catastrophe.
The U.S. Army Corps of Engineers has determined that the 60-year-old Whittier Narrows Dam is structurally unsafe and poses a potentially catastrophic risk to the working-class communities along the San Gabriel River floodplain. According to an agency report based on research conducted last year, unusually heavy rains could trigger a premature opening of the dam’s massive spillway.
A single photograph of rapid erosion below Oroville Dam’s emergency spillway — and an unidentified geologist’s worried question about whether the local sheriff knew how dire the situation might be — were the key events that led to the evacuation of 180,000 people living along the Feather River on Feb. 12.
In the confusion and chaos of the emergency at Oroville Dam, as thousands of residents were being evacuated, public safety officials and others involved in managing the crisis found themselves clashing with the people operating the nation’s tallest dam.
A towering spillway at the nation’s tallest dam was crumbling, and tens of thousands of people were fleeing for their lives. But as darkness fell, state officials realized dealing with the unfolding crisis in Northern California was about to get even worse: They couldn’t see.
No living soul can testify of the winter of 1861-62, when 45 days of rain transformed the Central Valley into a 300-mile-long inland sea. And only some Stocktonians are old enough to remember the last time the city itself flooded, in the 1950s.
A team investigating the Oroville Dam spillway breach in February said it has not seen evidence that a comprehensive review of its construction and design has ever been conducted since it was built nearly 40 years ago. … Agencies like the Bureau of Reclamation, which operates Shasta Dam, do more comprehensive construction and design reviews.
A team of independent experts charged Tuesday that the state and federal officials who inspected Oroville Dam relied too heavily on visual inspections, ignoring blueprints, construction records and other documented clues that could have warned them about the dam’s troubled flood-control spillway long before it fractured in February. … The forensic team’s report brought a swift response from Assemblyman James Gallagher, R-Yuba City, whose constituents were among those evacuated.
The most detailed report yet on what went wrong at Oroville Dam last winter when 180,000 people fled amid fears of flooding found that state and federal officials failed to uncover long-standing construction and maintenance issues at the nation’s tallest dam.
The UC Berkeley group analyzing the state Department of Water Resources’ response to the spillway crisis is still not satisfied with the department’s explanation for Oroville Dam’s “green spot” in a report released earlier this week.
Hurricane Harvey is sure to add more crushing debt to the National Flood Insurance Program, which is already $25 billion in the red. So when Congress resumes on Tuesday, will it immediately act to fix this troubled program?
As torrential rains and dangerous flood waters pummel large swaths of Texas and parts of Louisiana, California lawmakers are eying legislation to prevent similar damage from from the state’s own disasters.
The state Department of Water Resources has released a report on the Oroville Dam’s “green spot,” declaring the extensive area of persistent moisture on the face of the dam is due to seasonally trapped rainfall and poses no threat to the dam’s integrity.
Two weeks before Harvey’s flood waters engulfed much of Houston, President Donald Trump quietly rolled back an order by his predecessor that would have made it easier for storm-ravaged communities to use federal emergency aid to rebuild bridges, roads and other structures so they can better withstand future disasters. … [Former President Barack] Obama’s now-defunct order also revamped Federal Flood Risk Management Standards, calling for tighter restrictions on new construction in flood-prone areas.
Taxpayers have spent billions of dollars on dams, levees and bypasses to keep Sacramento and other Central Valley towns and cities from flooding, but experts say the infrastructure would prove no match for a megastorm like the one that pummeled Houston this week.
The massive flooding Harvey has caused in Texas and Louisiana comes as Congress weighs renewing a federal flood insurance program that continually pays out more than it takes in through premiums, potentially leaving taxpayers on the hook for $24.6 billion and counting.
The devastation Hurricane Harvey has wrought in southeastern Texas has brought new focus to the National Flood Insurance Program — and to a pending Republican effort to restructure and partially privatize an industry that has been effectively subsidized with tens of billions of federal taxpayer dollars.
Tropical Storm Harvey has dumped 15 trillion gallons of water on southeastern Texas. Scientists warn that with climate change, future storms will be wetter and more intense – that includes in California.
After more than a century of building levees higher to hold back its rivers, California took another step Friday toward a flood-control policy that aims to give raging rivers more room to spread out instead.
The Oroville City Council fired off a critical letter to the Federal Energy Regulatory Commission, criticizing how the Department of Water Resources operates Oroville Dam and demanding a host of changes.
Construction at the Lake Oroville spillways is on schedule to meet a Nov. 1 deadline for this year’s repairs, according to the Department of Water Resources. The department has passed the midway point on its construction timeline for this year’s repairs on the main spillway, which was badly damaged during high February releases.
President Donald Trump said Tuesday he has signed a new executive order intended to make more efficient the federal permitting process for construction of transportation, water and other infrastructure projects without harming the environment.
The failure of the Oroville spillway in February led people to notice a large green spot on Lake Oroville’s dam. The spot has been there for years, but the questions remain as to whether it’s a sign the dam is leaking.
Federal disaster officials have agreed to chip in $22.8 million to help California pay the estimated $500 million cost of the Oroville Dam crisis. … Department of Water Resources spokeswoman Erin Mellon said Wednesday during a biweekly conference call with reporters that she expects more money to come the state’s way.
Consider a couple of scenarios for big trouble at Oroville Dam: First: The facility’s main concrete spillway suffers serious damage, resulting in erosion of the rock beneath it — and potentially threatening the safety of the dam itself.
Friday is the deadline to file a claim with the state government to have a chance of being reimbursed for damages suffered during the Oroville Dam spillway emergency. … Residents may be eligible to receive money to compensate for travel expenses, damage to property, and loss of salary or benefits.
One week before the deadline to formally seek payment from the state of California for damages stemming from the Oroville Dam’s spillway failure this year, the state has received 93 claims worth a combined $1.1 billion.
Six months ago, relentless winter storms dumped nearly 13 inches of rain in four days on the Sierra Foothills, tearing an enormous hole in the spillway at Oroville Dam, the nation’s highest, and leading to an unprecedented emergency that prompted the evacuation of 188,000 people from nearby towns. Today, what could have been ground zero for America’s worst dam disaster is now a hotbed of construction activity.
The heavy work is now underway on emergency repairs to the nearly 3 miles of levee protecting the heart of Yuba City. The Sutter Butte Flood Control Agency received federal approval Tuesday night to proceed wth the work.
Drone video released by the California Department of Water Resources shows how repairs are moving along at the Oroville Dam’s main spillway, which crumbled during the extremely wet winter and forced the evacuation of 180,000 people.
California officials have ordered owners of 93 dams to reinspect their flood-control spillways following the Oroville Dam crisis, including seven in eastern Fresno County…. Large dams on the list include New Exchequer, which creates Lake McClure on the Merced River, and Don Pedro Dam on the Tuolumne River, which contains the sixth-largest reservoir in California.
California officials have ordered owners of 93 dams to reinspect their flood-control spillways following the Oroville Dam crisis, saying the spillways need a closer look following a preliminary review. The list released by the Department of Water Resources includes some of the largest dams in California, such as the New Exchequer Dam on the Merced River, New Bullards Bar on the Yuba River, and Lake Almanor Dam on the Feather River in Plumas County.
Officials in charge of repairing the damaged spillways at Lake Oroville said they’ve received the needed authorization from state and federal agencies for 2017 construction plans. The plan now is to continue preparing the demolished main spillway for concrete to be poured over the next few weeks.
Work to strengthen Oroville Dam, shore up downstream levees and other types of flood-prevention projects would be eligible for fast-tracked state approval under new California legislation lawmakers will consider when they return from summer recess next month.
One of the country’s foremost experts on catastrophic engineering failures released a new report Thursday on the troubled Oroville Dam that asks a disturbing question: Is the country’s tallest dam leaking?
State water resources officials and federal regulators caused the failure of the Oroville Dam spillway in February by ignoring long-established guidelines and neglecting their duty to manage risks and detect flaws, a scathing report by a Berkeley engineering expert concluded Thursday.
Construction work on a portion of the Marysville Ring Levee – deemed by a federal agency as the “weakest link” in the city’s levees – began earlier this month along Highway 70. … John Nicoletti, a levee commissioner for Marysville, said the U.S. Army Corps of Engineers has assessed the ring levee and found that Binney Junction is the city’s most vulnerable point.
For the first time in more than six months, no federally monitored rivers in California or Nevada are flooding or at risk of flooding, according to climate scientists. From Jan. 4 to July 15, at least one California or Nevada river fed by the Sierra Nevada was at or above flood monitoring stage, following a historically wet winter.
Congress is considering sweeping changes to the debt-laden National Flood Insurance Program that could jack up flood insurance rates for hundreds of thousands of homeowners under a bill that a Florida real estate group called “devastating.”
In its eighth memorandum released Thursday, the independent board analyzing the redesign of the Oroville Dam spillways commends the construction contractor’s work and makes slight tweaks to former recommendations.
Trails, roads and campgrounds throughout the Sierra high country were hit hard by snow and runoff from one of the largest snowpacks in recorded history, leaving public agencies scrambling and summer visitors feeling lost.
The state Department of Water Resources has filed a request with the Federal Energy Commission to demolish and reconstruct an additional 240 feet of the main Oroville Dam spillway upper chute this season. The purpose of the change is to ensure the reconstruction can be complete in two seasons, per a recent FERC filing.
The Department of Water Resources have asked federal regulators to let it demolish and replace an additional 240 feet of the spillway’s 3,000-foot concrete chute before the rains comes this fall, leaving less work for next year.
Nearly 80 days after winning the bid to fix the disastrous Oroville Dam spillways, the contractor Kiewit offered the Chico Enterprise-Record and Oroville Mercury-Register Friday a close-up view of construction efforts.
The preliminaries are just about over. Permanent structural repairs are about to begin at Oroville Dam. Five months after an unprecedented emergency forced a mass evacuation, state officials said Wednesday they’re ready to start replacing the now-demolished lower portions of Oroville’s main flood-control spillway.
Anyone who contemplated the wreckage of the Oroville Dam’s main spillway back in February — either while water was pounding down the shattered concrete structure or when the flow was stopped later and the enormity of the damage was fully visible — probably had this thought cross their mind: “That is going to be tough to fix.”
Facing a crisis after a huge crater formed in the main flood-control spillway at Oroville Dam, officials at the California Department of Water Resources called in an old hand to help: David Gutierrez, a nationally known engineer who had just retired as chief of the agency’s dam-safety division.
Inside a cavernous northern Utah warehouse, hydraulic engineers send water rushing down a replica of a dam built out of wood, concrete and steel – trying to pinpoint what repairs will work best at the tallest dam in the U.S for a spillway torn apart in February during heavy rains that triggered the evacuation of 200,000 people living downstream.
The flooding is the result of more than a week of high temperatures that have rapidly melted mountain snow, filling Pine Flat Reservoir and prompting the Army Corps of Engineers to send a surge of water into the Kings River to make room for more runoff behind the dam. The river surge tested levees along the Kings in a way some residents has never expected.
Water releases from Pine Flat Dam were ratcheted up Thursday as federal officials worked to prevent the reservoir from overtopping the dam. … Crews from Kings County and the Kings River Conservation District responded to a small breach in a levee on the south fork of the Kings River between Grangville and Highway 198.
Work at the Oroville Dam will carry on in spite of the 110 degree-plus temperatures anticipated this week. There are protections in place for construction employees with the contractor, Kiewit, and concrete has to undergo a cooling techniques to be able to keep applying it, said Jeff Petersen, the company’s project director in a press conference call Wednesday morning.
The rush of workers and heavy machinery to the shore of Lake Oroville is so vast and unfamiliar it’s fanning rumors across this rural region that the ruckus couldn’t just be for a historic dam repair. … But as state officials gave The Chronicle a tour last week of the construction site, they said the effort was both extensive and relatively straightforward.
Fresh off the Oroville Dam crisis, California lawmakers on Thursday voted to make dam-safety plans secret through language that was quietly inserted into a budget-related bill. The legislation, which requires Gov. Jerry Brown’s signature before becoming law, says emergency action plans at dams would be kept confidential to “protect public safety.”
In February, damage to the spillway of the dam on Lake Oroville in Butte County, California, and erosion under the dam’s emergency spillway threatened to send billions of gallons of water cascading through dozens of California communities. The dam did not collapse, but the damage to the spillway and the emergency spillway was enormous.
This weekend the water level in Isabella Lake is expected to reach — and maybe even exceed — the restricted pool allowed by the U.S. Army Corps of Engineers. And that means it might be time for residents who reside below the lake’s troubled dam to review their risks.
Concerned Trinity Dam could suffer the same fate as Oroville Dam — which had a near catastrophic failure this past winter — the Trinity County Board of Supervisors on Tuesday agreed to continue to pursue getting an emergency spillway built on the dam.
Even as President Donald Trump has announced his intention for the U.S. to withdraw from a global climate agreement, many of the nation’s river communities are responding to climate change by raising or replacing bridges that suddenly seem too low to stay safely above water.
The helicopters alone cost more than $100,000 a day at one point. Weeks of dredging debris ran to more than $22 million. And on the day after the massive evacuation, as the crisis was peaking, the state spent $3,902 on breakfasts and lunches for emergency workers.
If you’re expecting a quick and easy answer on what caused the spillway failure at Oroville Dam, think again. The leader of the independent forensics team studying the Oroville crisis said Thursday that the crack in the dam’s main flood-control spillway likely was caused by a combination of problems.
The Enterprise-Record/Oroville Mercury-Record got its closest look so far Wednesday at the Oroville Dam spillway work on a site visit hosted by the state Department of Water Resources. … The visit included an hour-long meeting in a conference room at DWR’s Oroville headquarters, and a trip to catch a view of lower spillway blasting around 12:30 p.m. followed by access to the structure above the spillway.
AB 646, which has passed two committees and could go to the Assembly floor next week, would require landlords throughout California to provide written notification to those renting in “a special flood hazard area or an area of potential flooding.”
President Donald Trump made rebuilding the nation’s infrastructure a major job-creating campaign pledge. But while his first big federal budget proposal has $200 billion for that purpose, most of it won’t be available until late 2018 and beyond.
Three months after Coyote Creek overflowed its banks and caused $100 million in damage to homes and businesses in San Jose, a flood control project straddling the city’s northern edges with Milpitas may be in danger of being shut down because of red tape. …
Federal dam regulators are reevaluating how they conduct dam inspections in the wake of the Oroville Dam spillway crisis, and they’ve ordered the nation’s dam operators to thoroughly inspect their facilities to see “if they have a potential Oroville waiting to happen,” a federal dam inspector said Sunday.
State officials plan to stop releasing water down the mangled main spillway at Oroville Dam on Friday, allowing workers to begin months of round-the-clock repairs to the chute and to an emergency spillway that is also badly damaged.
A hole in the concrete spillway chute of the Oroville Dam first made itself known 100 days ago. How it got there is still a mystery, as is what it will cost to fix the resulting damage and whether a fix will be in place in time for the next rainy season.
The deaths of five people in two Tulare County rivers in less than a month are prompting officials to warn the public about the dangers of rushing water fed by the heavy snowpack now melting in the Sierra. “Stay away from the river’s edge, and don’t enter the water,” said Tulare County Sheriff Mike Boudreaux.
America’s tallest dam was built from earth, stone and concrete – and the towering ambition of Gov. Pat Brown. Sixty years before a crisis at Oroville Dam sent thousands fleeing for their lives in February, the late governor brought an almost evangelical zeal to erecting the structure that would hold back the Feather River to deliver water to the parched southern half of the state.
Trouble had been developing at the Oroville Dam and the main spillway had been shut down; water started flowing over the emergency spillway and the hillside below it started disintegrating at an alarming rate. Late afternoon on Feb. 12, evacuation orders were issued. By most people’s accounts, it didn’t go well.
If a fresh look had been taken at Oroville Dam — any time between 50 years ago and last year — could the breakup of the spillway have been avoided? Is enough being done to ensure that work done today will keep the communities downstream of the dam safe? Should the Department of Water Resources remain in charge of the dam in the future?
The amount of money Donald Trump’s administration reimburses California for repairs to Oroville Dam could depend on whether the state properly maintained the dam’s spillway prior to it crumbling this winter, a state water official told lawmakers Thursday.
As in most of the other community meetings the Department of Water Resources has conducted about the Oroville Dam spillway crisis, staff members Tuesday night offered profuse apologies and community members voiced distrust. … Many of those who stood to speak said they or their families had also been present for the floods of the past (1955, 1986, 1997).
There’s more debris in the water at the Oroville Dam Diversion Pool than initially thought, and state Department of Water Resources officials now don’t expect to complete dredging and hauling of debris by December. DWR is seeking bids for the remaining work.
The massive failure of the Oroville Dam’s main spillway in February involved two dozen potential design and maintenance problems, including thin concrete, inadequate reinforcing steel and weaknesses in the foundation, a panel of engineering experts reported Wednesday.
In a report released Wednesday, engineers assigned to investigate the February failure of Oroville Dam’s main spillway cited a variety of flaws in the 3,000-foot-long structure, including variations in the thickness of the concrete slabs, poor drainage beneath the spillway, improperly filled cracks and signs of inadequate maintenance.
California is putting communities downstream in danger of flooding with the way it runs the now-crippled Oroville Dam, mayors and county leaders wrote this week in a strongly worded letter to Gov. Jerry Brown.
The melting of this year’s record snowpack is continuing to create problems, with authorities warning of more flooding in Yosemite National Park and fast-moving, high water at a popular Central Valley river.
California is borrowing up to $500 million to pay for the crisis at Oroville Dam, although it expects to be reimbursed for its costs. … Kiewit Corp. of Omaha, Neb., has won a $275.4 million contract for the repairs, which are expected to take two years.
California is asking the federal government to pay 75 percent of the hundreds of millions of dollars in repairs to the badly damaged spillways at the nation’s tallest dam, a state water agency spokeswoman said Monday.
The independent board overseeing the repair of the damage main Oroville Dam spillway has recommended the state Department of Water Resources change its priorities and focus on the damaged bottom chute rather than the top.
Outside consultants agree with the state’s plan to spend the next two summers replacing sections of Oroville Dam’s still largely intact upper spillway rather than trying to tear it all out in one season. But the public can’t see the recommendations the independent board of consultants gave the Department of Water Resources to ensure the work is safe and sound.
High temperatures put the Merced River in Yosemite National Park over flood stage on Thursday as snow from higher elevations melted and flowed into the river’s basin. But most Central California reservoirs, preparing for the warmer weather and melting snowpack throughout the Sierra, have excess capacity to handle such runoff.
The rain has largely stopped after one of the wettest winters in California. But as spring temperatures begin to climb and snow in the Sierra Nevada melts, the threat of flooding has communities across the Central Valley on edge. … The concerns are magnified in some areas by subsidence, a festering problem exacerbated by five years of drought in the Central Valley.
Cindy Messer apologized Tuesday to several hundred grim Oroville residents who had been ordered to run from their homes three months earlier. They sat rigidly in their seats inside the Oroville Municipal Auditorium at the first public meeting Messer’s agency, the Department of Water Resources, has hosted in Oroville since the February crisis at the dam.
Will there be a viewing platform where the public can watch work being done on the Oroville spillway? That’s the plan, according to Cindy Messer, Chief Deputy Director of the Department of Water Resources.
The Stanislaus River charged at well above its typical May volume as Lucas Huffman launched his kayak Tuesday at Knights Ferry. … The central part of the [Sierra Nevada] range has had near-record rain and snow. Temperatures have spiked past 90 degrees, and the snowmelt has sped up.
State officials on Monday reported a near-record May snowpack, but the bountiful winter that demolished California’s five-year drought is now increasing the risk of late spring flooding, as temperatures climb across the Sierra Nevada.
Water experts say the heavy spring runoff will likely continue until summer, testing California’s flood management efforts in what is a delicate balance between keeping enough water behind dams to prevent downstream surges and releasing enough to make space for the incoming melt.
Deep in the Trinity Alps, 130 miles northwest of the troubled Oroville Dam, local officials are raising alarms about another earthen dam with documented weaknesses and limited capacity for releasing the water that has poured in from storms and melting snow.
A power industry consulting firm has proposed a design for the Oroville Dam spillways which involves not repairing the current one, but building a new, wider spillway. … Kenneth Viney, manager of CoastalGen Inc., based in Napa, filed suggestions Monday with the Federal Energy Regulatory Commission, or FERC.
“I’m sorry. I’m sorry for the impact on your lives,” Bill Croyle told a crowd of more than 250 people at the Butte County Fairgrounds. Croyle, the acting director of the Department of Water Resources, answered questions and listened Thursday evening as people stepped up to a microphone and were heard during the first of the water agency’s community meetings about the Oroville Dam spillway disaster and evacuations.
California officials are keeping another document on the Oroville Dam recovery sealed from public view but promise to release a redacted version within a week. The Department of Water Resources filed an update Thursday from the outside consultants advising DWR on Oroville repairs.
Two experts weighed in on the memos that the Board of Consultants assessing the current operations and future spillway options sent to the Department of Water Resources. … A former engineer who reviews disasters and a Chico State University engineering professor reviewed the memos and talked to this newspaper about their questions, comments and concerns.
Rivers were swift and wide this winter with heavy storms adding up to the wettest winter in 122 years. People who have lived in the Sacramento Valley for decades remember flooding from their youth, when towns were evacuated, homes were lost and topsoil washed away.
Members of the state Senate Natural Resources and Water Committee, at an hourlong oversight hearing on the Oroville crisis, questioned Secretary John Laird, the head of the Department of Water Resources and Natural Resources, on the specifications of the $275 million contract awarded earlier this month to Kiewit Corp. of Omaha, Neb., to fix the dam’s two damaged spillways.
For the first time since the Lake Oroville spillway crisis began, members of the state Legislature peppered key water leaders with questions about what happened, what will happen next and what can be learned from it all.
The head of California’s water agency on Tuesday repeated his assertion that an emergency spillway at the Oroville Dam worked, drawing an incredulous response from a state lawmaker who represents tens of thousands of people ordered to evacuate when it was feared erosion at the spillway could lead to catastrophic flooding.
A pair of crippled spillways at Oroville Dam can be repaired in part by November, but a good deal of the work will probably have to be done after the next rainy season, according to reports by an independent panel of experts.
The damage has been done and the repair contract awarded. … How much will be the responsibility of homeowners, businesses, farmers and other customers of the more than two dozen local and regional agencies that contract with the State Water Project?
Official reports released Monday say the catastrophic damage to Oroville Dam’s main spillway probably stemmed from swift water flows under the concrete chute, which was cracked and of uneven thickness.
Responding to criticism about secrecy around the Oroville Dam repair effort, California officials released two redacted reports Monday from outside engineers consulting on plans to fix the dam’s battered spillways.
Citing the near disaster at Oroville Dam, a group of congressional Democrats is pushing the government’s watchdog agency to investigate federal oversight of dam safety regulations. … Separately, the California state Senate Natural Resources and Water Committee will hold an oversight hearing on Oroville next Tuesday [April 25].
A disaster expert’s review of the Oroville Dam spillway emergency says the Department of Water Resources could have prevented everything with better design, better construction and better maintenance. Robert Bea prepared the report published Monday.
A coalition of environmental groups that had warned Oroville Dam’s emergency spillway was fatally flawed long before it nearly washed away this winter is demanding that federal regulators open up dam repair plans for public vetting.
Late in the afternoon of Feb. 12, Sheriff Kory Honea was at the emergency operations center for the tallest dam in America when he overheard someone say something that stopped him in his tracks: “This is not good.”
As state officials clamp down on records at Oroville Dam, one of the country’s foremost experts on catastrophic engineering failures has used state inspection reports, photographs and historical design specifications to piece together an autopsy detailing why the spillway at the country’s tallest dam failed so spectacularly this winter.
California water officials Monday awarded a $275 million contract to repair the troubled Oroville Dam to a subsidiary of one of the world’s largest construction companies that is headquartered in Omaha, Nebraska.
Design flaws, construction shortcomings and maintenance errors caused the Oroville Dam spillway to break apart in February, according to an independent analysis by Robert Bea for the Center for Catastrophic Risk Analysis at UC Berkeley.
State officials have reopened the damaged spillway at Oroville Dam as another set of rainstorms began moving across Northern California. … Water will continue pouring down the spillway for up to two weeks, depending on how much more rain falls.
California’s top water official said Thursday he’s considering releasing redacted copies of safety and progress reports at the troubled Oroville Dam after his office had tried to keep them secret because of terrorism concerns.
With stormy weather approaching, state water managers announced Thursday they will resume releasing water down a damaged spillway at the nation’s tallest dam. The badly eroded main spillway at California’s Oroville Dam hasn’t been used since March 27.
It’s not just the residents of Oroville, Gridley and Yuba City who are frustrated with the Department of Water Resources’ lack of transparency concerning the Oroville Dam spillways. Two California legislators who represent those living downstream from the dam are also upset that they aren’t getting answers. … The state Senate’s Natural Resources Committee has a hearing scheduled at 9 a.m. April 25 that will go over what happened with the Oroville Dam spillway.
A state-commissioned report on climate change released Wednesday raises the stakes for fighting global warming, offering a clearer and, in some cases, more catastrophic picture of how much sea levels will rise in California.
Gov. Jerry Brown’s administration is using federal security regulations written to thwart terrorism to deny public access to records that experts say could guide repairs to the Oroville Dam and provide insight into what led to the near catastrophic failure of its emergency spillway.
The Manteca Unified School District must pay to fund local levee improvements, just like any other property owner in the area, an appeals court has found. One attorney says the decision is good news for the small levee districts across the Delta charged with protecting farms and cities from floods.
California’s Dept. of Water Resources has announced a fast-track plan to replace the shattered spillways at Oroville Dam — at least partially — by November 1, when the rainy season is expected to resume. Meanwhile, engineers at Oroville Dam are drilling cores and conducting geological studies, hoping to better understand February’s near-catastrophic spillway failures.
California officials on Thursday announced an ambitious plan to increase the size of Lake Oroville’s damaged main spillway, allowing it to release nearly twice as much water, as they seek to rebuild the 3,000-foot-long concrete chute that gave way this year.
State officials sketched a two-year recovery plan Thursday for the battered Oroville Dam spillway, revealing a blueprint that’s far from complete, still in need of a price tag and certain to leave the structure partially damaged as the next rainy season approaches.
The Department of Water Resources can operate the Oroville Dam project in an emergency capacity until Aug. 24. The U.S. Army Corps of Engineers approved an emergency permit for the state water agency Feb. 24, and it is good for six months.
Since the Oroville Dam spillway incident highlighted flaws in the current system, Yuba-Sutter officials are in the process of revising evacuation plans. Both Yuba and Sutter counties have been gathering information from the public regarding the February evacuation and plan on using the situation as a learning tool.
Citing potential security risks, state and federal officials are blocking the public’s ability to review documents that could shed light on repair plans and safety issues at crippled Oroville Dam. … The secrecy on the part of state dam operators prompted state Sen. Jim Nielsen to call for an immediate oversight hearing.
It’s a race against time this spring as water roars out of Central California’s dams and rumbles its way to the lowest-lying areas of the western San Joaquin Valley, communities where land is collapsing and water channels are growing more unstable. State engineers are generating new maps to understand where water is stagnating in spots it once flowed freely, and to learn which communities are in the most danger of flooding.
President Donald Trump announced Sunday more than a half-billion dollars would be coming to California to help cover the damage from the winter storms, including $274 million for repairs to the Oroville Dam spillway. The fulfillment of the fourth presidential declaration for damage from the winter storms totals an estimated $540 million.
The state Department of Water Resources gave the overseeing federal agency of the Oroville Dam what it asked for last week — a schedule for the independent review team investigating the cause of the spillway failures, but it listed no deadline for a final report from the team.
After millions of dollars of flood damage and mass evacuations this year, California is grappling with how to update its aging flood infrastructure. That has some calling for a new approach to flood control – one that mimics nature instead of trying to contain it.
As snow continued to fall on the eastern Sierra Nevada on Monday, platoons of earth movers, cranes and utility trucks fanned out across the Owens Valley, scrambling to empty reservoirs and clean out a lattice-work of ditches and pipelines in a frantic effort to protect the key source of Los Angeles’ water.
The operators of Oroville Dam acknowledged Monday they might not be able to permanently repair the dam’s battered main spillway in time for the next rainy season, but said they’re confident the fractured structure will be usable.
California’s top water manager said Monday that the problem-plagued Oroville Reservoir will have a new spillway in place to prevent potentially dangerous outflows of water in time for the next rainy season.
More than a month after Coyote Creek spilled its banks and flooded surrounding neighborhoods, city leaders Thursday said some 500 families remain unable to return home and pleaded with property owners to help house them.
The main spillway at Oroville Dam is riddled with design flaws and so badly damaged that an independent panel of experts hired by the state has concluded it’s probably impossible to repair the structure completely before the next rainy season begins in November.
Safety experts say there is no time for delay in a state plan to restore the 770-foot Oroville Dam, and they warn California would face a “very significant risk” if a damaged spillway is not in working order by fall, the start of the next rainy season.
While a nearly record-breaking rainy season has battered California’s dams and stretched the limits of local levees, the storms that began to hit Sacramento on Tuesday aren’t expected to put much additional strain on the state’s flood-control system.