The Bureau of Reclamation runs 58 dams across the western United States

The Bureau of Reclamation is a federal agency within the Department of the Interior that builds and operates dams, reservoirs, and water delivery systems in 17 western states. It does not run every dam in the country — most dams are owned by states, counties, utilities, or private companies. But Reclamation's dams are among the largest and most visible, and they serve multiple purposes: storing water for cities and farms, controlling floods, and generating hydroelectric power.

Reclamation was created in 1902 to bring water to the arid West. Today it manages about 476 reservoirs and operates roughly 58 major dams. The agency's largest and most famous projects include Hoover Dam (on the Colorado River between Nevada and Arizona), Glen Canyon Dam (Arizona), and Shasta Dam (California). These dams supply water to roughly 31 million people and irrigate about 10 million acres of farmland.

If you live in the West or use electricity from a western grid, Reclamation's infrastructure likely affects your water supply or power bill. Understanding which dams Reclamation operates, where they are, and what they do can help you understand where your water and power come from.

Key Takeaways

  • The Bureau of Reclamation is a federal agency that operates 58 major dams across 17 western states, primarily for water storage, flood control, and hydroelectric power generation.
  • Reclamation's dams supply water to about 31 million people and irrigate roughly 10 million acres of farmland in the West.
  • Famous Reclamation dams include Hoover Dam, Glen Canyon Dam, and Shasta Dam, each serving multiple purposes and regions.
  • You can find information about specific dams, water releases, and power generation on the Bureau of Reclamation's website, organized by region.

Where Reclamation dams are located

Reclamation operates dams in 17 western states: California, Colorado, Idaho, Kansas, Montana, Nebraska, Nevada, New Mexico, North Dakota, Oklahoma, Oregon, South Dakota, Texas, Utah, Washington, Wyoming, and Arizona. The agency groups its operations into five regions: Pacific Northwest, Upper Colorado, Lower Colorado, Mid-Pacific, and South-Central.

The largest concentration of Reclamation dams is in the Colorado River Basin, which includes Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming. The Colorado River system alone includes Hoover Dam, Glen Canyon Dam, and Parker Dam. The Pacific Northwest region includes dams on the Columbia River and its tributaries, such as Grand Coulee Dam in Washington, one of the largest hydroelectric dams in the world.

California's Central Valley Project, operated by Reclamation, includes Shasta Dam and Friant Dam, which together store water for millions of people and thousands of farms. Each region has its own water challenges: the Pacific Northwest deals with salmon migration and flood control, the Colorado Basin manages severe water scarcity, and the Central Valley balances agricultural and urban demand.

What Reclamation dams do

Reclamation dams serve three main purposes. Water storage is the primary function — dams create reservoirs that hold water during wet years and release it during dry years, allowing cities and farms to have a steady supply year-round. Flood control is the second purpose: dams can hold back floodwaters during heavy rain or snowmelt, protecting downstream communities. Hydroelectric power generation is the third: water flowing through dam turbines generates electricity that is sold to utilities and consumers.

Some Reclamation dams serve all three purposes, while others focus on one or two. Hoover Dam, for example, stores water for Nevada, Arizona, and California; prevents floods on the Colorado River; and generates about 2,000 megawatts of electricity. Glen Canyon Dam stores water in Lake Powell and generates power, but its primary purpose shifted after the dam was built to include environmental management of the Colorado River downstream. Shasta Dam stores water for California's Central Valley and generates power, but it also helps manage salmon migration and flood control.

The balance between these purposes often creates tension. Storing more water for drought years means less water flowing downstream for environmental purposes. Releasing water for power generation may conflict with irrigation schedules. Reclamation must negotiate these tradeoffs with states, tribes, environmental groups, and water users.

How Reclamation decides when to release water

Reclamation releases water from its reservoirs based on contracts with states and water districts, environmental requirements, power demand, and current water levels. The agency publishes monthly and annual water release schedules on its website, broken down by dam and region. These schedules are public information and change based on snowpack, rainfall, and demand.

For the Colorado River, Reclamation follows rules set by the Colorado River Compact of 1922 and updated by later agreements. These rules specify how much water each state receives and how much must flow to Mexico. Lake Mead and Lake Powell, the two largest reservoirs in the system, are monitored constantly. When water levels drop below certain thresholds, Reclamation cuts the amount of water released to downstream states.

You can check current water levels, release schedules, and power generation data for most Reclamation dams on the agency's website. Each regional office publishes this information regularly, and some dams have real-time data feeds. If you depend on water from a Reclamation reservoir — for drinking water, irrigation, or power — your local water utility or power company can tell you how much of your supply comes from Reclamation and how current releases affect your area.

The difference between Reclamation dams and other western dams

Not all large western dams are operated by Reclamation. Some are run by the U.S. Army Corps of Engineers, which operates dams primarily for flood control and navigation on rivers like the Missouri and Sacramento. Others are owned by states (like California's Oroville Dam), utilities (like Pacific Gas and Electric's dams in California), or private companies. A few are run by Native American tribes.

Reclamation dams tend to be larger and older than average, and they were built with federal funding specifically to support western settlement and agriculture. This history shapes how they operate today. Reclamation must balance the original purpose — delivering water to farms and cities — with newer requirements like environmental protection and power generation. The agency also manages water rights that are often contested between states and between agricultural and urban users.

If you want to know which dam supplies your water or power, your local water utility or power company can tell you. They can also explain how drought, dam operations, and water agreements affect your rates and supply.

How to find information about a specific Reclamation dam

The Bureau of Reclamation's main website is usbr.gov. From there, you can navigate to your region and find information about specific dams, including their location, size, purpose, current water levels, and power generation. Each dam has a fact sheet with basic information, and many have real-time data on water storage and releases.

If you need historical information — how much water a dam released in a specific year, or how drought affected operations — Reclamation publishes annual reports and historical data. You can also contact your regional Reclamation office directly. The agency has five regional offices, and staff can answer questions about how a dam affects your area.

Local water utilities and power companies also have detailed information about which Reclamation dams supply them and how operations affect your bill. If you are curious about where your water or power comes from, your utility's website or customer service line is often the fastest way to get an answer specific to your location.

Environmental and legal challenges facing Reclamation dams

Reclamation dams face ongoing pressure to balance water storage and power generation with environmental protection. Dams block fish migration, alter river temperatures, and change how much water flows downstream. The Colorado River, for example, is now so heavily managed that it rarely reaches the ocean. Reclamation must work with environmental groups, states, and tribes to manage these impacts.

Water rights disputes are another major challenge. The Colorado River Compact allocated water based on unusually wet years, and the river now does not have enough water to meet all the commitments. Reclamation has had to negotiate cuts to water deliveries to Arizona, Nevada, and California. These negotiations are complex and ongoing, and they affect millions of people.

Climate change is adding pressure. Snowpack in the Rocky Mountains and Sierra Nevada is declining, which means less water flows into Reclamation reservoirs. At the same time, demand for water is rising. Reclamation is working with states and water users to plan for a drier future, but the solutions are difficult and expensive.

Frequently Asked Questions

Can I visit a Bureau of Reclamation dam?

Many Reclamation dams allow public visits, though rules vary by location. Hoover Dam, for example, offers tours and has a visitor center. Glen Canyon Dam also has a visitor center. Contact the specific dam or your regional Reclamation office to find out what is open to the public and what safety rules explore.

How much electricity does a Reclamation dam generate?

It depends on the dam. Hoover Dam generates about 2,000 megawatts. Grand Coulee Dam in Washington generates about 6,800 megawatts, making it one of the largest hydroelectric dams in the world. Smaller dams generate much less. Reclamation publishes annual power generation data for each dam on its website.

What happens if a Reclamation reservoir runs out of water?

Reclamation has legal agreements with states and water districts that specify how water is shared during shortages. When a reservoir drops below certain levels, water deliveries to downstream users are cut. This has happened on the Colorado River in recent years, with Arizona, Nevada, and California all receiving less water than their full allocation.

Does Reclamation charge for water?

Reclamation does not sell water directly to consumers. Instead, it delivers water to states and water districts under contracts, and those entities charge their customers. Power generated by Reclamation dams is sold to utilities, which pass the cost to consumers. Your water and power bills reflect these costs, though Reclamation's rates are generally lower than market rates.

How do I learn about my water comes from a Reclamation dam?

Contact your local water utility and ask where your water supply comes from. They can tell you which dams, reservoirs, or rivers feed your system. Many utilities publish this information on their websites or in annual water quality reports.