The Mexican Water Treaty of 1944 committed the U.S. to deliver
1.5 million acre-feet of water to Mexico on an annual basis, plus
an additional 200,000 acre-feet under surplus conditions. The
treaty is overseen by the International Boundary and Water
Commission.
Colorado River water is delivered to Mexico at Morelos Dam,
located 1.1 miles downstream from where the California-Baja
California land boundary intersects the river. The river’s
natural terminus is the Gulf of California in Mexico, but because
of the dams and diversion facilities throughout the Colorado
River Basin, natural flow rarely reaches the Gulf. Water diverted
at Morelos Dam is primarily used to irrigate Mexicali Valley
farmland, and also supplies the cities of Mexicali, Tecate and
Tijuana.
Still water in the Tijuana River Valley reflects the chirping
birds who live there, giving the impression it is as nature
made it — until you see the floating trash and smell the
stagnant, polluted water. For decades, activists tried to clean
up the Tijuana River’s watershed as it flowed from Tijuana into
San Diego’s coastal waters, which are contaminated with both
human and industrial waste. A recent study from the Scripps
Institution of Oceanography found that coastal pollution is
also transferring to the air. “This is nothing short of an
environmental and public health crisis, and it has been made
worse by the fact that California companies are part of the
problem,” said State Senator Steve Padilla Monday, while
announcing SB 1178, a bill to address cross-border pollution.
A pair of new state bills are looking to crack down on some of
the polluters fueling the cross-border sewage crisis that has
hobbled access to San Diego County’s southernmost beaches for
decades. Senate Bill 1178 and Senate Bill 1208, introduced on
Monday by State Sen. Steve Padilla, add regulations to water
discharges for large corporations, as well as prevent water
authorities from issuing additional permits for waste releases
into areas in the Tijuana River system.
For decades, raw sewage from Tijuana, Mexico has, and
continues, to flow across the border into San Diego,
California. This discharge flows into the Tijuana River
Valley, and ultimately to the Pacific Ocean. This
pollution has negatively impacted the Tijuana River Valley and
the Tijuana River Estuary, one of the last remaining estuaries
in California, and the beaches. Unhealthy concentrations
of fecal indicator bacteria has forced the County of San Diego
to close 10 miles of beach access from the US-Mexico Border all
the way to the beaches of Coronado. At the urging of
Congressman Scott Peters, the San Diego State University School
of Public Health issued a white paper which details the public
health risks posed by the transborder flow of sewage.
It has been far too dry for far too long in Mexico as a
combination of drying reservoirs and increasing population has
caused concerns of a water crisis. According to data from
the National Oceanic and Atmospheric Administration, most
of Mexico, including areas around and to the north of Mexico
City, are in a long-term drought. … Local media
reports that reservoirs could completely be out of water
by late August if conditions don’t improve. … Elizabeth
Carter, an assistant professor of civil engineering and earth
sciences at Syracuse University … notes … that the U.S
engineering projects in rivers that feed many of Mexico’s
northern freshwater sources run dry before reaching Mexico. She
cites the Hoover Dam, Glen Canyon Dam, and the Central Arizona
Project (Colorado River) as examples.
…Local artists and curators…have taken on the task of
remembering the [Mexicali] region’s departed waters. Since
2020, [they] have overseen the Archivo Familiar del Río
Colorado, or Colorado River Family Album, a project that brings
together contemporary art, environmental education and
historical research to document bodies of water that are
disappearing or are already gone … In 2024, an
exhibition at Planta Libre will collect archival documents and
artwork that engages with water and its loss. Local artists
will lead a series of walks in the surrounding region so that
visitors can develop their own relationship with it
… the absence of the Colorado River and the waters it
nourished forms a cartography of loss that is written on the
landscape. Their mission is to make those absences visible — to
keep their memories alive, and to imagine possibilities for the
future.
A new report released Tuesday and written by researchers
at San Diego State University calls the Tijuana River a “public
health crisis,” citing broad evidence of unhealthy conditions
from untreated sewage to industrial waste. Authors
synthesize multiple studies that have documented pollution over
the years, leading with a recent paper that documented that the
threat also extends to ocean-going mammals. Bottle nose
dolphins stranded in San Diego died from infection by a
bacteria “generally transmitted through contact with feces or
urine in contaminated water, food or soil.
Martha Guzman recalls those awful
days working on water and other issues as a deputy legislative
secretary for then-Gov. Jerry Brown. California was mired in a
recession and the state’s finances were deep in the red. Parks
were cut, schools were cut, programs were cut to try to balance a
troubled state budget in what she remembers as “that terrible
time.”
She now finds herself in a strikingly different position: As
administrator of the U.S. Environmental Protection Agency’s
Region 9, she has a mandate to address water challenges across
California, Nevada, Arizona and Hawaii and $1 billion to help pay
for it. It is the kind of funding, she said, that is usually
spread out over a decade. Guzman called it the “absolutely
greatest opportunity.”
Water is flowing once again
to the Colorado River’s delta in Mexico, a vast region that
was once a natural splendor before the iconic Western river was
dammed and diverted at the turn of the last century, essentially
turning the delta into a desert.
In 2012, the idea emerged that water could be intentionally sent
down the river to inundate the delta floodplain and regenerate
native cottonwood and willow trees, even in an overallocated
river system. Ultimately, dedicated flows of river water were
brokered under cooperative
efforts by the U.S. and Mexican governments.
For the bulk of her career, Jayne
Harkins has devoted her energy to issues associated with the
management of the Colorado River, both with the U.S. Bureau of
Reclamation and with the Colorado River Commission of Nevada.
Now her career is taking a different direction. Harkins, 58, was
appointed by President Trump last August to take the helm of the
United States section of the U.S.-Mexico agency that oversees
myriad water matters between the two countries as they seek to
sustainably manage the supply and water quality of the Colorado
River, including its once-thriving Delta in Mexico, and other
rivers the two countries share. She is the first woman to be
named the U.S. Commissioner of the International Boundary and
Water Commission for either the United States or Mexico in the
commission’s 129-year history.
Nowhere is the domino effect in
Western water policy played out more than on the Colorado River,
and specifically when it involves the Lower Basin states of
California, Nevada and Arizona. We are seeing that play out now
as the three states strive to forge a Drought Contingency Plan.
Yet that plan can’t be finalized until Arizona finds a unifying
voice between its major water players, an effort you can read
more about in the latest in-depth article of Western Water.
Even then, there are some issues to resolve just within
California.
It’s high-stakes time in Arizona. The state that depends on the
Colorado River to help supply its cities and farms — and is
first in line to absorb a shortage — is seeking a unified plan
for water supply management to join its Lower Basin neighbors,
California and Nevada, in a coordinated plan to preserve water
levels in Lake Mead before
they run too low.
If the lake’s elevation falls below 1,075 feet above sea level,
the secretary of the Interior would declare a shortage and
Arizona’s deliveries of Colorado River water would be reduced by
320,000 acre-feet. Arizona says that’s enough to serve about 1
million households in one year.
The Colorado River Delta once spanned nearly 2 million acres and
stretched from the northern tip of the Gulf of California in
Mexico to Southern California’s Salton Sea. Today it’s one-tenth
that size, yet still an important estuary, wildlife habitat and
farming region even though Colorado River flows rarely reach the
sea.
This issue of Western Water examines the ongoing effort
between the United States and Mexico to develop a
new agreement to the 1944 Treaty that will continue the
binational cooperation on constructing Colorado River
infrastructure, storing water in Lake Mead and providing instream
flows for the Colorado River Delta.
As vital as the Colorado River is to the United States and
Mexico, so is the ongoing process by which the two countries
develop unique agreements to better manage the river and balance
future competing needs.
The prospect is challenging. The river is over allocated as urban
areas and farmers seek to stretch every drop of their respective
supplies. Since a historic treaty between the two countries was
signed in 1944, the United States and Mexico have periodically
added a series of arrangements to the treaty called minutes that
aim to strengthen the binational ties while addressing important
water supply, water quality and environmental concerns.
California’s little-known New River has been called one of North
America’s most polluted. A closer look reveals the New River is
full of ironic twists: its pollution has long defied cleanup, yet
even in its degraded condition, the river is important to the
border economies of Mexicali and the Imperial Valley and a
lifeline that helps sustain the fragile Salton Sea ecosystem.
Now, after decades of inertia on its pollution problems, the New
River has emerged as an important test of binational cooperation
on border water issues. These issues were profiled in the 2004
PBS documentary Two Sides of a River.
Redesigned in 2017, this beautiful map depicts the seven
Western states that share the Colorado River with Mexico. The
Colorado River supplies water to nearly 40 million people in
Arizona, California, Colorado, Nevada, New Mexico, Utah, Wyoming
and the country of Mexico. Text on this beautiful, 24×36-inch
map, which is suitable for framing, explains the river’s
apportionment, history and the need to adapt its management for
urban growth and expected climate change impacts.
The Colorado River provides water to 40 million people and 4
million acres of farmland in a region encompassing some 246,000
square miles in the southwestern United States. The 32-page
Layperson’s Guide to the Colorado River covers the history of the
river’s development; negotiations over division of its water; the
items that comprise the Law of the River; and a chronology of
significant Colorado River events.
As part of the historic Colorado
River Delta, the Salton Sea regularly filled and dried for
thousands of years due to its elevation of 237 feet below
sea level.
The Mexican Water Treaty of 1944 committed the U.S. to deliver
1.5 million acre-feet of water to Mexico on an annual basis, plus
an additional 200,000 acre-feet under surplus conditions. The
treaty is overseen by the International Boundary and Water
Commission.
Colorado River water is delivered to Mexico at Morelos Dam,
located 1.1 miles downstream from where the California-Baja
California land boundary intersects the river between the town of
Los Algodones in northwestern Mexico and Yuma County, Ariz.
The Colorado River Delta is located
at the natural terminus of the Colorado River at the Gulf of
California, just south of the U.S.-Mexico border. The desert
ecosystem was formed by silt flushed downstream from the Colorado
and fresh and brackish water mixing at the Gulf.
The Colorado River Delta once covered 9,650 square miles but has
shrunk to less than 1 percent of its original size due to
human-made water diversions.
This printed issue of Western Water examines how the various
stakeholders have begun working together to meet the planning
challenges for the Colorado River Basin, including agreements
with Mexico, increased use of conservation and water marketing,
and the goal of accomplishing binational environmental
restoration and water-sharing programs.
This printed issue of Western Water examines the
Colorado River Basin Water Supply and Demand Study and what its
finding might mean for the future of the lifeblood of the
Southwest.
This printed issue of Western Water explores some of the major
challenges facing Colorado River stakeholders: preparing for
climate change, forging U.S.-Mexico water supply solutions and
dealing with continued growth in the basins states. Much of the
content for this issue of Western Water came from the in-depth
panel discussions at the September 2009 Colorado River Symposium.
This printed copy of Western Water examines the Colorado River
Delta, its ecological significance and the lengths to which
international, state and local efforts are targeted and achieving
environmental restoration while recognizing the needs of the
entire river’s many users.