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Water Education Foundation
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Maps & Posters April 17, 2014 California Water Bundle

California Water Map
Updated December 2016

A new look for our most popular product! And it’s the perfect gift for the water wonk in your life.

Our 24×36 inch California Water Map is widely known for being the definitive poster that shows the integral role water plays in the state. On this updated version, it is easier to see California’s natural waterways and man-made reservoirs and aqueducts – including federally, state and locally funded projects – the wild and scenic rivers system, and natural lakes. The map features beautiful photos of California’s natural environment, rivers, water projects, wildlife, and urban and agricultural uses and the text focuses on key issues: water supply, water use, water projects, the Delta, wild and scenic rivers and the Colorado River.

Map is UV coated to resist fading. Suitable for framing, copies of the map are available for $20 each, plus applicable tax and shipping charges.

To order 10 copies or more at a discounted price, contact the Foundation at 916-444-6240.

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Referring Pages

Western Water March 17, 2023 Nick Cahill California Water Map WESTERN WATER-Testing at the Source: California Readies a Groundbreaking Hunt to Check for Microplastics in Drinking Water By Nick Cahill

Testing at the Source: California Readies a Groundbreaking Hunt to Check for Microplastics in Drinking Water
WESTERN WATER NOTEBOOK: Regulators and water systems are finalizing a first-of-its-kind pilot that will determine whether microplastics are contaminating water destined for the tap

Image shows a test jar filled with microplastic debrisTiny pieces of plastic waste shed from food wrappers, grocery bags, clothing, cigarette butts, tires and paint are invading the environment and every facet of daily life. Researchers know the plastic particles have even made it into municipal water supplies, but very little data exists about the scope of microplastic contamination in drinking water. 

After years of planning, California this year is embarking on a first-of-its-kind data-gathering mission to illuminate how prevalent microplastics are in the state’s largest drinking water sources and help regulators determine whether they are a public health threat.

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Publication December 14, 2022 Brian Brown California Water Map

Winter 2023 California Project WET Gazette
Volume XXVlll, Issue I

New Tools for Exploring Water – Past, Present & Future

Welcome to a New Year, Project WET Educators! The traditional season of gift-giving and thanks may have ended for you with the removal of lights and storing of decorations. But I’m hoping this Gazette may extend the season for you well into the New Year by highlighting a small treasure-trove of online tools and resources that have been recently released or updated – and can be used with Project WET activities. 

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Western Water October 28, 2022 Nick Cahill California Water Map By Nick Cahill

As Climate Change Erodes Western Snowpacks, One Watershed Tries A ‘Supershed Approach’ To Shield Its Water Supply
WESTERN WATER SPOTLIGHT: Groundwater banks, a high-elevation reservoir and improved weather forecasting are how American River water managers hope to replace the disappearing Sierra Nevada snowpack

Aerial view of French Meadows reservoir, near the headwaters of the Middle Fork of the American River. The foundation of California’s water supply and the catalyst for the state’s 20th century population and economic growth is cracking. More exactly, it’s disappearing.

Climate change is eroding the mountain snowpack that has traditionally melted in the spring and summer to fill rivers and reservoirs across the West. Now, less precipitation is falling as snow in parts of major mountain ranges like California’s Sierra Nevada and the Rockies in the West, and the snow that does land is melting faster and earlier due to warming temperatures.

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Publication December 17, 2021 Brian Brown California Water Map

Winter 2022 California Project WET Gazette
Volume XXVll, Issue I

Exploring Water Infrastructure & Climate Resilience

Winter is coming. Every ‘Game of Thrones’ fan knows this dreaded warning and plea to all in the Seven Kingdoms to unite before its too late to counter a climate disaster complete with frozen zombies.

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Western Water November 19, 2021 Alastair Bland California Water Map WESTERN WATER-California Spent Decades Trying to Keep Central Valley Floods at Bay. Now It Looks to Welcome Them Back By Alastair Bland

California Spent Decades Trying to Keep Central Valley Floods at Bay. Now It Looks to Welcome Them Back
WESTERN WATER IN-DEPTH: Floodplain restoration gets a policy and funding boost as interest grows in projects that bring multiple benefits to respond to climate change impacts

Land and waterway managers labored hard over the course of a century to control California’s unruly rivers by building dams and levees to slow and contain their water. Now, farmers, environmentalists and agencies are undoing some of that work as part of an accelerating campaign to restore the state’s major floodplains.

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Western Water July 28, 2021 California Water Map By Gary Pitzer

Long Troubled Salton Sea May Finally Be Getting What it Most Needs: Action — And Money
WESTERN WATER NOTEBOOK: California's largest lake could see millions in potential funding to supercharge improvements to address long-delayed habitat and dust suppression needs

A sunset along the shoreline of California's Salton Sea.State work to improve wildlife habitat and tamp down dust at California’s ailing Salton Sea is finally moving forward. Now the sea may be on the verge of getting the vital ingredient needed to supercharge those restoration efforts – money.

The shrinking desert lake has long been a trouble spot beset by rising salinity and unhealthy, lung-irritating dust blowing from its increasingly exposed bed. It shadows discussions of how to address the Colorado River’s two-decade-long drought because of its connection to the system. The lake is a festering health hazard to nearby residents, many of them impoverished, who struggle with elevated asthma risk as dust rises from the sea’s receding shoreline. 

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Western Water April 30, 2021 Solving Water Challenges in Disadvantaged Communities California Water Map By Gary Pitzer

Pandemic Lockdown Exposes the Vulnerability Some Californians Face Keeping Up With Water Bills
WESTERN WATER IN-DEPTH: Growing mountain of water bills spotlights affordability and hurdles to implementing a statewide assistance program

Single-family residential customers who are behind on their water bills in San Diego County's Helix Water District can get a one-time credit on their bill through a rate assistance program funded with money from surplus land sales.As California slowly emerges from the depths of the COVID-19 pandemic, one remnant left behind by the statewide lockdown offers a sobering reminder of the economic challenges still ahead for millions of the state’s residents and the water agencies that serve them – a mountain of water debt.

Water affordability concerns, long an issue in a state where millions of people struggle to make ends meet, jumped into overdrive last year as the pandemic wrenched the economy. Jobs were lost and household finances were upended. Even with federal stimulus aid and unemployment checks, bills fell by the wayside.

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Publication December 14, 2020 Brian Brown California Water Map

Winter 2021 California Project WET Gazette
Volume XXVl, Issue I

Offline Activities for an Online World

“The work of education is divided between the teacher and the environment.” ​

― Maria Montessori

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Western Water February 27, 2020 Layperson's Guide to Climate Change and Water Resources California Water Map Gary Pitzer

Can Carbon Credits Save Sacramento-San Joaquin Delta Islands and Protect California’s Vital Water Hub?
WESTERN WATER NOTEBOOK: An ambitious plan would use carbon credits as incentives to convert Delta islands to wetlands or rice to halt subsidence and potentially raise island elevations

Equipment on this tower measures fluctuations in greenhouse gas emissions for managed wetlands on Sherman Island in the Sacramento-San Joaquin Delta.The islands of the western Sacramento-San Joaquin Delta are sinking as the rich peat soil that attracted generations of farmers dries out and decays. As the peat decomposes, it releases tons of carbon dioxide – a greenhouse gas – into the atmosphere. As the islands sink, the levees that protect them are at increasing risk of failure, which could imperil California’s vital water conveyance system.

An ambitious plan now in the works could halt the decay, sequester the carbon and potentially reverse the sinking.

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Western Water February 6, 2020 California Water Map Gary Pitzer

Meet the Veteran Insider Who’s Shepherding Gov. Newsom’s Plan to Bring Climate Resilience to California Water
WESTERN WATER Q&A: Former journalist Nancy Vogel explains how the draft California Water Resilience Portfolio came together and why it’s expected to guide future state decisions

Nancy Vogel, director of the Governor’s Water Portfolio Program, highlights key points in the draft Water Resilience Portfolio last month for the Water Education Foundation's 2020 Water Leaders class. Shortly after taking office in 2019, Gov. Gavin Newsom called on state agencies to deliver a Water Resilience Portfolio to meet California’s urgent challenges — unsafe drinking water, flood and drought risks from a changing climate, severely depleted groundwater aquifers and native fish populations threatened with extinction.

Within days, he appointed Nancy Vogel, a former journalist and veteran water communicator, as director of the Governor’s Water Portfolio Program to help shepherd the monumental task of compiling all the information necessary for the portfolio. The three state agencies tasked with preparing the document delivered the draft Water Resilience Portfolio Jan. 3. The document, which Vogel said will help guide policy and investment decisions related to water resilience, is nearing the end of its comment period, which goes through Friday, Feb. 7.

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Western Water November 21, 2019 California Water Map Gary Pitzer

Can a New Approach to Managing California Reservoirs Save Water and Still Protect Against Floods?
WESTERN WATER NOTEBOOK: Pilot Projects Testing Viability of Using Improved Forecasting to Guide Reservoir Operations

Bullards Bar Dam spills water during 2017 atmospheric river storms.Many of California’s watersheds are notoriously flashy – swerving from below-average flows to jarring flood conditions in quick order. The state needs all the water it can get from storms, but current flood management guidelines are strict and unyielding, requiring reservoirs to dump water each winter to make space for flood flows that may not come.

However, new tools and operating methods are emerging that could lead the way to a redefined system that improves both water supply and flood protection capabilities.

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Western Water October 24, 2019 California Water Map Gary Pitzer

Understanding Streamflow Is Vital to Water Management in California, But Gaps In Data Exist
WESTERN WATER NOTEBOOK: A new law aims to reactivate dormant stream gauges to aid in flood protection, water forecasting

Stream gauges gather important metrics such as  depth, flow (described as cubic feet per second) and temperature.  This gauge near downtown Sacramento measures water depth.California is chock full of rivers and creeks, yet the state’s network of stream gauges has significant gaps that limit real-time tracking of how much water is flowing downstream, information that is vital for flood protection, forecasting water supplies and knowing what the future might bring.

That network of stream gauges got a big boost Sept. 30 with the signing of SB 19. Authored by Sen. Bill Dodd (D-Napa), the law requires the state to develop a stream gauge deployment plan, focusing on reactivating existing gauges that have been offline for lack of funding and other reasons. Nearly half of California’s stream gauges are dormant.

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Western Water September 26, 2019 California Water Map Gary Pitzer

Often Short of Water, California’s Southern Central Coast Builds Toward A Drought-Proof Supply
WESTERN WATER NOTEBOOK: Water agencies in Santa Barbara, San Luis Obispo counties look to seawater, recycled water to protect against water shortages

The spillway at Lake Cachuma in central Santa Barbara County. Drought in 2016 plunged its storage to about 8 percent of capacity.The southern part of California’s Central Coast from San Luis Obispo County to Ventura County, home to about 1.5 million people, is blessed with a pleasing Mediterranean climate and a picturesque terrain. Yet while its unique geography abounds in beauty, the area perpetually struggles with drought.

Indeed, while the rest of California breathed a sigh of relief with the return of wet weather after the severe drought of 2012–2016, places such as Santa Barbara still grappled with dry conditions.

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Western Water August 22, 2019 California Water Map Gary Pitzer

How Private Capital is Speeding up Sierra Nevada Forest Restoration in a Way that Benefits Water
WESTERN WATER SPOTLIGHT: A bond fund that fronts the money is expediting a headwaters restoration project to improve forest health, water quality and supply

District Ranger Lon Henderson with Tahoe National Forest points toward an overgrown section of forest within the Blue Forest project area. The majestic beauty of the Sierra Nevada forest is awe-inspiring, but beneath the dazzling blue sky, there is a problem: A century of fire suppression and logging practices have left trees too close together. Millions of trees have died, stricken by drought and beetle infestation. Combined with a forest floor cluttered with dry brush and debris, it’s a wildfire waiting to happen.

Fires devastate the Sierra watersheds upon which millions of Californians depend — scorching the ground, unleashing a battering ram of debris and turning hillsides into gelatinous, stream-choking mudflows. 

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Western Water July 25, 2019 California Water Map Gary Pitzer

A Study of Microplastics in San Francisco Bay Could Help Cleanup Strategies Elsewhere
WESTERN WATER NOTEBOOK: Debris from plastics and tires is showing up in Bay waters; state drafting microplastics plan for drinking water

Plastic trash and microplastics can get washed into stormwater systems that eventually empty into waterways. Blasted by sun and beaten by waves, plastic bottles and bags shed fibers and tiny flecks of microplastic debris that litter the San Francisco Bay where they can choke the marine life that inadvertently consumes it.

A collaborative effort of the San Francisco Estuary Institute, The 5 Gyre Institute, San Francisco Bay Regional Water Quality Control Board and the regulated discharger community that aims to better understand the problem and assess how to manage it in the San Francisco Bay is nearing the end of a three-year study.

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Western Water July 11, 2019 California Water Map

Your Don’t-Miss Roundup of Summer Reading From Western Water

Dear Western Water reader, 

Clockwise, from top: Lake Powell, on a drought-stressed Colorado River; Subsidence-affected bridge over the Friant-Kern Canal in the San Joaquin Valley;  A homeless camp along the Sacramento River near Old Town Sacramento; Water from a desalination plant in Southern California.Summer is a good time to take a break, relax and enjoy some of the great beaches, waterways and watersheds around California and the West. We hope you’re getting a chance to do plenty of that this July.

But in the weekly sprint through work, it’s easy to miss some interesting nuggets you might want to read. So while we’re taking a publishing break to work on other water articles planned for later this year, we want to help you catch up on Western Water stories from the first half of this year that you might have missed. 

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Western Water June 27, 2019 California Water Map Gary Pitzer

Can Providing Bathrooms to Homeless Protect California’s Water Quality?
WESTERN WATER IN-DEPTH: The connection between homelessness and water is gaining attention under California human right to water law and water quality concerns

A homeless camp set up along the Sacramento River near downtown Sacramento. Each day, people living on the streets and camping along waterways across California face the same struggle – finding clean drinking water and a place to wash and go to the bathroom.

Some find friendly businesses willing to help, or public restrooms and drinking water fountains. Yet for many homeless people, accessing the water and sanitation that most people take for granted remains a daily struggle.

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Western Water April 25, 2019 California Water Map Gary Pitzer

California’s New Natural Resources Secretary Takes on Challenge of Implementing Gov. Newsom’s Ambitious Water Agenda
WESTERN WATER Q&A: Wade Crowfoot addresses Delta tunnel shift, Salton Sea plan and managing water amid a legacy of conflict

Wade Crowfoot, California Natural Resources Secretary.One of California Gov. Gavin Newsom’s first actions after taking office was to appoint Wade Crowfoot as Natural Resources Agency secretary. Then, within weeks, the governor laid out an ambitious water agenda that Crowfoot, 45, is now charged with executing.

That agenda includes the governor’s desire for a “fresh approach” on water, scaling back the conveyance plan in the Sacramento-San Joaquin Delta and calling for more water recycling, expanded floodplains in the Central Valley and more groundwater recharge.

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Western Water December 7, 2018 California Water Map Water & the Shaping of California Gary Pitzer

No Longer a ‘Boys Club’: In the World of Water, Women Are Increasingly Claiming Center Stage
WESTERN WATER NOTEBOOK: Since late 2017, women have taken leading roles at Reclamation, DWR, Metropolitan Water District and other key water agencies

Women named in the last year to water leadership roles (clockwise, from top left): Karla Nemeth, director, California Department of Water Resources; Gloria Gray,  chair, Metropolitan Water District of Southern California; Brenda Burman, Bureau of Reclamation Commissioner; Jayne Harkins,  commissioner, International Boundary and Water Commission, U.S. and Mexico; Amy Haas, executive director, Upper Colorado River Commission.The 1992 election to the United States Senate was famously coined the “Year of the Woman” for the record number of women elected to the upper chamber.

In the water world, 2018 has been a similar banner year, with noteworthy appointments of women to top leadership posts in California — Karla Nemeth at the California Department of Water Resources and Gloria Gray at the Metropolitan Water District of Southern California.

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Western Water November 16, 2018 California Water Map Layperson's Guide to the State Water Project Gary Pitzer

As He Steps Aside, Tim Quinn Talks About ‘Adversarialists,’ Collaboration and Hope For Solving the State’s Tough Water Issues
WESTERN WATER Q&A: Tim Quinn, retiring executive director of Association of California Water Agencies

ACWA Executive Director Tim Quinn  with a report produced by Association of California Water Agencies on  sustainable groundwater management.  (Source:  Association of California Water Agencies)In the universe of California water, Tim Quinn is a professor emeritus. Quinn has seen — and been a key player in — a lot of major California water issues since he began his water career 40 years ago as a young economist with the Rand Corporation, then later as deputy general manager with the Metropolitan Water District of Southern California, and finally as executive director of the Association of California Water Agencies. In December, the 66-year-old will retire from ACWA.

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Western Water October 5, 2018 California Water Map Gary Pitzer

In Water-Stressed California and the Southwest, An Acre-Foot of Water Goes a Lot Further Than It Used To
WESTERN WATER NOTEBOOK-As households get stingier with water, a common guide for describing how much they need gets a refresh

The Antioch/Oakley Regional Shoreline park displays a sign announcing their water conservation efforts at the park in 2014.People in California and the Southwest are getting stingier with water, a story that’s told by the acre-foot.

For years, water use has generally been described in terms of acre-foot per a certain number of households, keying off the image of an acre-foot as a football field a foot deep in water. The long-time rule of thumb: One acre-foot of water would supply the indoor and outdoor needs of two typical urban households for a year.

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Western Water September 21, 2018 Colorado River Basin Map California Water Map Gary Pitzer

Despite Risk of Unprecedented Shortage on the Colorado River, Reclamation Commissioner Sees Room for Optimism
WESTERN WATER NOTEBOOK: Commissioner Brenda Burman, in address at Foundation’s Water Summit, also highlights Shasta Dam plan

Bureau of Reclamation Commissioner Brenda BurmanThe Colorado River Basin is more than likely headed to unprecedented shortage in 2020 that could force supply cuts to some states, but work is “furiously” underway to reduce the risk and avert a crisis, Bureau of Reclamation Commissioner Brenda Burman told an audience of California water industry people.

During a keynote address at the Water Education Foundation’s Sept. 20 Water Summit in Sacramento, Burman said there is opportunity for Colorado River Basin states to control their destiny, but acknowledged that in water, there are no guarantees that agreement can be reached.

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Western Water August 24, 2018 California Water Map Gary Pitzer

When Water Worries Often Pit Farms vs. Fish, a Sacramento Valley Farm Is Trying To Address The Needs Of Both
WESTERN WATER SPOTLIGHT: River Garden Farms is piloting projects that could add habitat and food to aid Sacramento River salmon

Roger Cornwell, general manager of River Garden Farms, with an example of a refuge like the ones that were lowered into the Sacramento River at Redding to shelter juvenile salmon.  Farmers in the Central Valley are broiling about California’s plan to increase flows in the Sacramento and San Joaquin river systems to help struggling salmon runs avoid extinction. But in one corner of the fertile breadbasket, River Garden Farms is taking part in some extraordinary efforts to provide the embattled fish with refuge from predators and enough food to eat.

And while there is no direct benefit to one farm’s voluntary actions, the belief is what’s good for the fish is good for the farmers.

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Western Water June 29, 2018 California Water Map Gary Pitzer

As Decision Nears On California Water Storage Funding, a Chairman Reflects on Lessons Learned and What’s Next
WESTERN WATER Q&A: California Water Commission Chairman Armando Quintero

Armando Quintero, chair of the California Water CommissionNew water storage is the holy grail primarily for agricultural interests in California, and in 2014 the door to achieving long-held ambitions opened with the passage of Proposition 1, which included $2.7 billion for the public benefits portion of new reservoirs and groundwater storage projects. The statute stipulated that the money is specifically for the benefits that a new storage project would offer to the ecosystem, water quality, flood control, emergency response and recreation.

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Western Water March 23, 2018 California Water Map Gary Pitzer

One Year In, A New State Policymaker Assesses the Salton Sea, Federal Relations and California’s Thorny Water Issues
WESTERN WATER Q&A: State Water Board member Joaquin Esquivel

State Water Resources Control Board member E. Joaquin EsquivelJoaquin Esquivel learned that life is what happens when you make plans. Esquivel, who holds the public member slot at the State Water Resources Control Board in Sacramento, had just closed purchase on a house in Washington D.C. with his partner when he was tapped by Gov. Jerry Brown a year ago to fill the Board vacancy.

Esquivel, 35, had spent a decade in Washington, first in several capacities with then Sen. Barbara Boxer, D-Calif., and then as assistant secretary for federal water policy at the California Natural Resources Agency. As a member of the State Water Board, he shares with four other members the difficult task of ensuring balance to all the uses of California’s water. 

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Aquapedia background September 8, 2016 California Water Map Layperson's Guide to California Water

Algal Blooms

Aerial photo of algal blooms in O'Neill Forebay in Merced County.y

Algal blooms are sudden overgrowths of algae. Their occurrence is increasing in California’s rivers, creeks and lakes and along the coast, threatening the lives of people, pets and fisheries.

Only a few types of algae can produce poisons, but even nontoxic blooms hurt the environment and local economies. When masses of algae die, the decaying can deplete oxygen in the water to the point of causing devastating fish kills.

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Aquapedia background August 25, 2016 Layperson's Guide to California Water California Water Map

Headwaters

Sierra Nevada headwaters streamHeadwaters are the source of a stream or river. They are located at the furthest point from where the water body empties or merges with another. Two-thirds of California’s surface water supply originates in these mountainous and typically forested regions.

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Publication May 20, 2014 California Water Map

Layperson’s Guide to California Water
Updated 2021

The 24-page Layperson’s Guide to California Water provides an excellent overview of the history of water development and use in California. It includes sections on flood management; the state, federal and Colorado River delivery systems; Delta issues; water rights; environmental issues; water quality; and options for stretching the water supply such as water marketing and conjunctive use. New in this 10th edition of the guide is a section on the human need for water. 

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Aquapedia background February 11, 2014 California Water Map

Watershed

A watershed is the land area that drains runoff – snowmelt and rain – into a connected system of lakes, streams, rivers, and other waterways. It typically is identified by the largest draining watercourse within the system. In California, for example, the Sierra Nevada is one of the state’s major watersheds.

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Aquapedia background February 11, 2014 California Water Map Layperson's Guide to California Water

Water Supply in California

SnowmeltCalifornia’s “Mediterranean” climate, characterized by warm, dry summers and mild winters, is considered one of its great attractions, but it also can be unpredictable with flooding followed by drought and few years of “normal” precipitation.  [See also Hydrologic Cycle].

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Aquapedia background February 11, 2014 California Water Map Layperson's Guide to the Central Valley Project

Tulare Lake Basin

Image shows flooded crop fields in Tulare Lake Basin in 2023Until the early 1900s, Central California’s Tulare Lake naturally appeared every winter as the southernmost rivers flowing out of the Sierra Nevada filled the dry lakebed with rainfall and melted snow.

In the spring, the shallow lake near Visalia could cover as much as 790 square miles, or four times the surface area of Lake Tahoe. By the end of the hot San Joaquin Valley summer, however, the giant lake – once the largest freshwater body west of the Mississippi River – could disappear primarily due to evaporation.

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Aquapedia background February 11, 2014 California Water Map Layperson's Guide to California Water

Sierra Nevada

The Sierra NevadaStretching along the eastern edge of the state, the Sierra Nevada region incorporates more than 25 percent of California’s land area and forms one of the world’s most diverse watersheds.

On average, more than 60 percent of California’s developed water supply originates in the Sierra and the southern Cascade Range in northeastern California, according to California’s Water Resilience Portfolio of 2020.

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Aquapedia background February 11, 2014 Dams Layperson's Guide to the Central Valley Project California Water Map

Shasta Dam

Image shows Shasta Dam from a distance, with the reservoir largely filled.Shasta Dam forms California’s largest storage reservoir, Shasta Lake, which can hold about 4.5 million acre-feet.

As the keystone of the federal Central Valley Project, Shasta stands among the world’s largest dams. Construction on the dam began in 1938 and was completed in 1945, with flood control as the highest priority.

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Aquapedia background February 11, 2014 California Water Map Layperson's Guide to California Water

Pacific Flyway

The Pacific Flyway is one of four major North American migration routes for birds, especially waterfowl, and extends from Alaska and Canada, through California, to Mexico and South America. Each year, birds follow ancestral patterns as they travel the flyway on their annual north-south migration. Along the way, they need stopover sites such as wetlands with suitable habitat and food supplies. In California, 90 percent of historic wetlands have been lost.

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Hydroelectric Power

William R. Gianelli Powerplant at San Luis Reservoir. Hydroelectric power is produced when water released from a reservoir turns a turbine connected to a generator.  Gravity causes water to drop toward a turbine propeller. The falling water then turns the turbine, which produces power through the connected generator.

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Aquapedia background February 4, 2014 Layperson's Guide to California Water California Water Map

Hetch Hetchy Reservoir and Water System

Hetch Hetchy – a Sierra Miwok word for a type of wild grass – is a valley in Yosemite National Park whose river was dammed to create a water supply for the San Francisco Bay Area. The O’Shaughnessy Dam on the Tuolumne River forms Hetch Hetchy Reservoir.

Owned by the city of San Francisco, Hetch Hetchy Reservoir provides water to 2.7 million residents and businesses in the San Francisco Bay Area.

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Aquapedia background February 3, 2014 All Things Drought California Water Map Layperson's Guide to Water Conservation Water Conservation Tips Up Close and Personal: Water Use at Home Drought FAQs

Drought

Lake Oroville shows the effects of drought in 2014.

Drought—an extended period of limited or no precipitation—is a fact of life in California and the West, with water resources following boom-and-bust patterns. During California’s 2012–2016 drought, much of the state experienced severe drought conditions: significantly less precipitation and snowpack, reduced streamflow and higher temperatures. Those same conditions reappeared early in 2021 prompting Gov. Gavin Newsom in May to declare drought emergencies in watersheds across 41 counties in California.

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Aquapedia background January 30, 2014 Layperson's Guide to California Water California Water Map Water & the Shaping of California

California Water Overview

Aerial view of the Sacramento-San Joaquin DeltaCalifornia will always be inextricably linked to its water resources. Water continues to shape the state’s development and no resource is as vital to California’s urban centers, farms, industry, recreation, scenic beauty and environmental preservation.

But California’s relationship to water is also one that continues to generate controversy.

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Related Links

Maps & Posters April 17, 2014 California Water Bundle
California Water bundle
Maps & Posters November 27, 2017

California Water Bundle
Special discount price for California water map and Layperson's Guide to California water

The California water bundle features our California Water Map and our updated and redesigned Layperson’s Guide to California Water, giving you the resources you need to understand water in the Golden State.

Regularly priced at $22 for the map and $18 for the guide, this bundle allows you to purchase both of these high-quality products for $35. Please note they ship separately.

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This item appears in:
  • Topic: Acre Foot
  • Topic List: Agriculture
  • Topic: Bay Delta
  • Topic: California Aqueduct
  • Maps & Posters
  • Topic: Bay Delta Conservation Plan
  • Topic: Central Valley
  • Topic: Central Valley Project
  • Topic: Colorado River
  • Topic List: Background Information
  • Topic: California Water Plan
  • Topic: Delta Issues
  • Topic: Drought
  • Topic: Folsom Dam
  • Topic: Klamath River
  • Topic: Friant Dam
  • Topic: Hetch Hetchy
  • Topic: Lake Tahoe
  • Topic: North Coast Rivers
  • Topic: Pyramid Lake
  • Topic: Sacramento San Joaquin Delta
  • Topic: Floods
  • Topic: Hoover Dam
  • Topic: Mono Lake
  • Topic: Russian River
  • Topic: Sacramento Valley
  • Topic: San Francisco Bay
  • Topic: Sacramento River
  • Topic: Salton Sea
  • Topic: Lake Mead
  • Topic: San Joaquin Valley
  • Topic: Lake Powell
  • Topic: Recreation
  • Topic: San Joaquin River Restoration
  • Topic: Sierra Nevada
  • Topic: Levees
  • Topic: Oroville Dam
  • Topic: Surface Water
  • Topic: San Luis Dam
  • Tulare Lake Basin
  • Topic: Shasta Dam
  • Topic: State Water Project
  • Topic: Water Supply
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