Stories in California

Water Is Life

When nature doesn’t have enough water, it’s only a matter of time before people don’t either.

A misty waterfall over rounded, mossy boulders.
California Freshwater Tiltill Creek on the path to Rancheria Falls at Hetch Hetchy Reservoir located inside Yosemite National Park. Sierra Nevada, California. © Simon Williams/TNC

Securing California's Water Future

Our state's water system is one of the most heavily engineered on the planet. California takes water from rivers, streams and aquifers and we do it with very few limits, leaving rivers to run dry, putting nature and people at risk. 

If we don't fix the flows, there won't be enough water for anyone. 

TNC's Water Plan for California

We identify precisely when and where nature needs water, and build the partnerships, projects and policies necessary to deliver it.

How we get there:

  1. Secure water for wetlands. Recover water supplies for California’s wetlands and create seasonal habitat for the migratory birds that rely on them.
  2. Make rivers flow again. Buy water, drive policy and catalyze partnerships to return flows to rivers.
  3. Rebalance water use. Work with farmers to change water use practices so communities and wildlife can thrive. 

Tackling the Barriers to Healthy River Flows

TNC has identified the three main reasons that California's rivers are in trouble. At the same time, we have three strategies to change the status quo.

Use the sliders below to see the problems and solutions. 


The Shasta River shown flowing through The Nature Conservancy's Shasta Big Springs Ranch below Mount Shasta in northern California.
A cracked and dry river.
Water users divert water at the wrong times and places. We’re working with users to reduce or improve diversions, such as by taking water during wet winters instead of dry summers. We’re also strategically buying water rights to keep water in rivers.
Flooded farm for bird habitat.
Groundwater pump.
Farms and cities use too much groundwater, draining rivers. We’re working to replenish aquifers—nature’s underground reservoirs—by reducing pumping and putting water back in. And we’re working with the state to ensure groundwater law protects against overdraft.
Jalama Creek on the Dangermond Preserve after dam removal.
A dam on Jalama Creek on the Dangermond Preserve.
Many dams are defunct or harm fish and wildlife. We’re removing old, obsolete dams and building on the momentum from major dam removals. Where a dam isn’t coming down any time soon, we’re using our science to help manage dam operations to improve flows.
We’ve assembled a portfolio of rivers where we can fix the flows and develop the practices and policies needed across the state.
Blazing a Path Forward TNC has strategically assembled a portfolio of rivers where we are developing policies and practices to improve flows for people and nature. We are restoring the flows in these rivers using our three core interventions: cutting down on diversion, protecting and recharging groundwater and removing or reoperating dams. We can show a way forward in what has so far been one of California’s most vexing environmental problems. We can fix this. © TNC

Strategic Actions to Fix River Flows

The map above shows our portfolio of priority rivers, where our recent successes expand on our strategies to return flows to rivers and keep them flowing. More hard work is needed, but the evidence suggests that we can do this.

  • Agriculture needs river water in the summer—but so do aquatic species. To balance these needs in the Navarro River watershed, we helped a vineyard secure a winter water right, allowing them to store abundant winter flows for irrigation and forgo diversions during low summer flows. We are expanding this model to other vineyards.

  • In one of our fastest deals ever, TNC acquired Miners Creek Ranch—with the goal of securing not only the land, but also the property’s senior water rights. The ranch is located on a tributary to the Scott River, and its water rights enable us to help endangered coho salmon in the Klamath Basin. By applying our science, we have identified when and where the stream needs more water, and we are reducing irrigation on the ranch to keep water in the river at key times, restoring the flows coho need to reproduce and thrive.

  • In important salmon watersheds, like the Navarro, we are pairing our flow restoration projects with groundwater recharge projects. By making small changes to the landscape (for instance, redirecting storm runoff away from culverts and into infiltration basins), we are demonstrating ways to give water back to aquifers—and consequently, to rivers and creeks as well. We are also working with counties to make sure they are taking into account the way new wells will deplete river flows—something that isn’t currently considered in the permit approval process.

  • Dams prevent highly endangered salmon and steelhead from accessing crucial habitat. TNC is tackling this head-on in Jalama Creek by demolishing two dams on our Jack and Laura Dangermond Preserve, and in Battle Creek in the foothills of Lassen Volcanic National Park by working with partners to speed up a large-scale dam removal.

Healthy Rivers

Drought: California's New Normal The California Salmon and Steelhead Coalition has a message for our state. Drought is here to stay, and nature is paying the price. If we want to protect our fresh water supplies in the long term, we need to protect the ecosystems that sustain them.

In California and around the world, rivers are the lifelines of our natural and human communities. Flowing throughout our state’s deserts, redwood forests, Sierra mountains and great Central Valley, California’s rivers provide a home for thousands of freshwater species, supply drinking water to more than 30 million Californians and are a significant water source for our $40 billion agricultural economy. They were also once home to many of the largest salmon migrations on the Pacific Coast—with seasonal runs in coastal rivers and the Central Valley numbering in the hundreds of thousands—a natural phenomenon that has dwindled to a trickle.

California’s outdated approaches to water management are failing to meet the water needs of people and nature, especially when water is the most scarce during the summer. By taking huge volumes of water directly from our rivers and by storing large amounts behind dams, we’ve severely altered how much water is flowing in our rivers and when. The amount of water in our rivers naturally varies from season to season throughout the year—and species like salmon and steelhead have evolved according to this fluctuation. But human alteration has left few resources for even the best drought-adapted species. At its worst, overuse and inefficient management are drying up some rivers during the summer, leaving no water for fish or for people.

Aerial view of a river running between lush trees.
Navarro River TNC is supporting community-level collaboration among water users in the Navarro River watershed, using techniques like water storage and changing the timing of diversions. © John Uhrig, Flikr

The good news is that in many cases, by being more efficient with our water use and dynamically managing when we take water from rivers, we can meet the needs of both people and river ecosystems. To overcome the challenges our rivers face, we are:

Two researchers along the Shasta River. One is standing in the river with a tape measure and the other is sitting on the bank with a clipboard.
Shasta River Conducting research along the Shasta River where it runs through Shasta Big Springs Ranch about 20 miles north of the town of Mt Shasta and near Mount Shasta. © Bridget Besaw
Aerial view of two oval, blue-green ponds with trees on one side and rows of grape plants on the other.
Husch Vineyards As a part of TNC's facilitation of community water management in the Navarro River watershed, we're helping water users like Husch Vineyards store winter water. © Pusher, Inc.
Shasta River Conducting research along the Shasta River where it runs through Shasta Big Springs Ranch about 20 miles north of the town of Mt Shasta and near Mount Shasta. © Bridget Besaw
Husch Vineyards As a part of TNC's facilitation of community water management in the Navarro River watershed, we're helping water users like Husch Vineyards store winter water. © Pusher, Inc.

Through these approaches, we are helping bring water security to people and ensuring enough water is left in rivers at the right times so salmon, steelhead and other river species can thrive. Since 2009, we have worked with partners to restore seasonal flow patterns to four rivers that are critically important to salmon and have purchased or facilitated more than 26,000 acre-feet (more than 8.5 billion gallons) of water to be left in rivers to support wildlife. This work complements TNC’s legacy of river habitat conservation for salmon and steelhead on more than 5,000 river miles statewide.

Notes from the Field TNC Scientist Jennifer Carah takes us inside a conservation dating service for endangered coho salmon on California’s North Coast. Join her in the river as she and our partners help these fish find that special someone.

Thriving Birds and Wetlands

Farming for Bird Habitat in California's Delta Located in the heart of the Sacramento-San Joaquin River Delta, Staten Island has 8,500 acres of farmland where TNC.

California’s Central Valley used to be a 10 million-acre wilderness, dotted with more than 4 million acres of lush wetlands. These wetlands made it prime habitat for tens of millions of birds on their yearly migration along the Pacific Flyway, from the taiga of the Arctic to the coastlines and forests of South America. 

Lesser and Greater Sandhill Cranes mingling at Woodbridge Ecological Reserve, Lodi, California
SANDHILL CRANES We are creating pop-up wetlands for birds on farmland—essentially, Airbnb for birds—using big data and a reverse auction market to select the highest value habitat, and proliferating this technique using a network approach. © Becky Matsubara

Today, more than 95% of those wetlands have disappeared, lost to farmland, urban sprawl, and an overburdened water system. Only about 200,000 acres of seasonal wetland remain, contained within a relatively small but critical number of public and private refuges. Unfortunately this habitat is not enough to support the millions of migratory birds that fly through looking for a place to land. 

Many species that once depended on these vast wetlands at key times of year, are now in deep trouble. Shorebirds, of which there are over 25 species that migrate through California, are particularly imperiled. California is considered to be one of the top 20 most threatened bird habitats in the country, and shorebird populations have declined by almost 40% in just the last 50 years. Their remaining habitat is at risk with predicted increases in the frequency and severity of drought. Even in very wet years, suitable habitat is not always available when birds need it. 

Fortunately, we’ve been hard at work piloting and implementing approaches to support the wetland habitat we have left and creatively use farmland to fill the habitat gap. To create enough habitat for migrating shorebirds, we are:

  • Purchasing and delivering water to farmland and existing public wetlands.

  • Creating “pop-up” wetlands for birds on farmland—essentially, Airbnb for birds—using big data and a reverse auction market to select the highest value habitat, and proliferating this technique using a network approach.

  • Building on this “pop-up” model to replenish underground aquifers, leading to benefits to birds, as well as farmers and people who rely on groundwater.

Orange to white colors show projected abundances of Dunlin as they fill California’s Central Valley in spring and again in fall.
“Pop-Up” Wetlands Orange to white colors show projected abundances of Dunlin as they fill California’s Central Valley in spring and again in fall. By flooding rice fields in spring, farmers north of Sacramento can create extra migratory stopover habitat at just the right time of year. © Alison Johnston/Cornell Lab Ornithology

Since 2014, we have partnered with farmers to create over 60,000 acres of high-quality, seasonal habitat, used by over 1 million migratory birds. Through the scaling of these approaches, we will seek to create 350,000 new acres of habitat annually by 2050 so that California’s shorebird populations, and the Pacific Flyway at large, can grow and thrive.

Sustainable Groundwater

Landscape view of Carrizo Plain National Monument, with a wide, dry plain covered in shrubby plants and hills in the distance.
CARRIZO PLAIN TNC is working to expand sustainable groundwater management policies to cover the entire state. © Lara Weatherly / TNC

Aquifers underground formed over millions of years. They are now one of the primary freshwater sources in California. About 85% of Californians depend on this underground water (known as groundwater) for some portion of their water supply. In a wet year in California, aquifers provide 40% of the water people use—in dry years, that number jumps to 60%. These percentages are even higher in the agricultural Central Valley and Central Coast. People pump this water out of the ground for drinking and irrigation, and native plants stretch their roots down deep to reach the water, creating wildlife habitat. 

Unfortunately, in many places, people are pumping this groundwater faster than rain can replenish it. Along with droughts, the unsustainable pumping of groundwater is leading to drinking water shortages and declining water quality for disadvantaged communities. Dying crops, habitat loss, and species extinctions are also unfortunate side effects. In some areas, land has even sunk by up to 30 feet.

Giant Kangaroo Rat | Notes from the Field Scientist Scott Butterfield introduces us to the amazing endangered species of Central California's Carrizo Plain, a protected landscape the size of Los Angeles. Join him as he monitors the health of the endangered giant kangaroo rat, the plain's grapefruit-sized ecosystem engineer!

Fortunately, with the support of TNC, California passed the Sustainable Groundwater Management Act, which, for the first time, limits the amount of groundwater that can be pumped, in the most affected parts of the state. The Act requires that local water agencies devise plans to stabilize their groundwater pumping, and thanks to TNC’s influence, it is one of only four pieces of legislation in the world that require nature’s groundwater needs to be considered alongside people’s. 

TNC is working to ensure that plans go beyond lip service and achieve actual sustainability. To do this, we’re providing feedback to the State on how well the submitted plans address the water needs of nature and the drinking water needs of disadvantaged communities. We’re also piloting solutions that simultaneously benefit wildlife, farmers, and disadvantaged communities, and making these solutions available to local water agencies that need to deliver on their sustainability plans. These solutions include:

An animated GIF shows how a water market can allow areas with surplus water to help areas with a water deficit.
With a water market in place If farmers don’t need all their water, they can trade it for cash, creating an incentive for them to conserve and use only the water they need. Farmers who need more than their allocated share can then buy water from the market, taking on the allocations of the farmers who have extra. © TNC

Finally, given that groundwater is a primary water source in locations outside the Central Valley as well, TNC is working to expand sustainable groundwater management policies to cover the entire state. 

Our goal is to sustain 3.6 million acres of groundwater-dependent ecosystems by 2050, providing habitat for more than 1,500 species of plants and animals. Through all this work, we will enable sustainable groundwater-use that gives people a reliable and resilient water supply, while also allowing groundwater-dependent wildlife to flourish.