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Topic: San Luis Dam

Overview April 24, 2014

San Luis Dam

Located on the west side of the San Joaquin Valley in the Coast Range foothills, San Luis Dam and Reservoir are used by the state and federal governments to store water diverted from the Delta. It is the largest offstream reservoir in the United States.

The San Luis Reservoir is a key water facility serving both the State Water Project and the federal Central Valley Project. It can hold 2 million acre-feet of water and is jointly owned by the federal Bureau of Reclamation and California’s Department of Water Resources.  The state’s share of the San Luis Reservoir water is 55 percent.

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Aquafornia news May 28, 2025 SFGate

California’s 2nd-largest reservoir hits record milestone after brutal dry spell

California’s second-largest reservoir (Lake Oroville) reached full capacity for the third year in a row Thursday, the first time it’s hit such a record in its 57-year history. … Its latest milestone comes as warming temperatures and snowmelt runoff made its way into the Feather River watershed. … Water levels are at 121% of the reservoir’s historical average for this time of year, which is a similar trend among nearly all if the state’s major reservoirs. With the exception of the San Luis Reservoir, which is sitting at 94% of its historical capacity, every major reservoir is above its average. The past wet winter in California has bolstered snowpack accumulation and cut detrimental drought conditions that have been persistent in previous years. 

Other California reservoir news:

  • Cal Coast News (San Luis Obispo, Calif.): A look at San Luis Obispo County rainfall totals, reservoir levels
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  • View Original Article
Western Water February 13, 2025 WESTERN WATER: Golden Mussel, California’s Newest Delta Invader, Is Likely Here To Stay – And Spread Sacramento-San Joaquin Delta Map Spencer Fordin and Douglas E. Beeman

Golden Mussel, California’s Newest Delta Invader, Is Likely Here To Stay – And Spread
WESTERN WATER NOTEBOOK: Aquatic hitchhiker adds to burden of invasive mussels challenging water agencies across the West

Image shows golden mussels clustered on a buoy, found during a survey in November 2024 at O'Neill Forebay at the foot of San Luis Reservoir in Merced County. The mussels were also discovered for the first time in North America last fall in the Sacramento-San Joaquin Delta and O'Neill Forebay. A new aquatic invader, the golden mussel, has penetrated California’s ecologically fragile Sacramento-San Joaquin Delta, the West Coast’s largest tidal estuary and the hub of the state’s vast water export system. While state officials say they’re working to keep this latest invasive species in check, they concede it may be a nearly impossible task: The golden mussel is in the Golden State to stay – and it is likely to spread.

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Tour April 20, 2022 - 7:30am - April 22, 2022 - 6:30pm Explore Epicenter of Drought and Groundwater Sustainability on the Central Valley Tour Nick Gray

Central Valley Tour 2022
Field Trip - April 20-22

Central Valley Tour participants at a dam.This tour ventured through California’s Central Valley, known as the nation’s breadbasket thanks to an imported supply of surface water and local groundwater. Covering about 20,000 square miles through the heart of the state, the valley provides 25 percent of the nation’s food, including 40 percent of all fruits, nuts and vegetables consumed throughout the country.

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Announcement March 6, 2019

A Bounty of San Joaquin Valley Crops on Display During Central Valley Tour
Act now, our April 3-5 tour is almost sold out!

The San Joaquin Valley, known as the nation’s breadbasket, grows a cornucopia of fruits, nuts and other agricultural products.

During our three-day Central Valley Tour April 3-5, you will meet farmers who will explain how they prepare the fields, irrigate their crops and harvest the produce that helps feed the nation and beyond. We also will drive through hundreds of miles of farmland and visit the rivers, dams, reservoirs and groundwater wells that provide the water.

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Announcement January 24, 2018

Central Valley Tour Offers Unique View of San Joaquin Valley’s Key Dams and Reservoirs
March 14-16 tour includes major federal and state water projects

Get a unique view of the San Joaquin Valley’s key dams and reservoirs that store and transport water on our March Central Valley Tour.

Our Central Valley Tour, March 14-16, offers a broad view of water issues in the San Joaquin Valley. In addition to the farms, orchards, critical habitat for threatened bird populations, flood bypasses and a national wildlife refuge, we visit some of California’s major water infrastructure projects.

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Video May 27, 2014

A Climate of Change: Water Adaptation Strategies

This 25-minute documentary-style DVD, developed in partnership with the California Department of Water Resources, provides an excellent overview of climate change and how it is already affecting California. The DVD also explains what scientists anticipate in the future related to sea level rise and precipitation/runoff changes and explores the efforts that are underway to plan and adapt to climate.

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Tour May 23, 2014 Images from the Central Valley Tour

Central Valley Tour 2014
Field Trip (past)

The 2014 tour took place April 23 – 25.

This 3-day, 2-night tour travels the length of the San Joaquin Valley, giving participants a clear understanding of the State Water Project and Central Valley Project.

  • Dennis Falaschi, Panoche Water District: Selenium Pilot Treatment for the Westside
  • Dennis Falaschi: San Joaquin River Improvement Project - Drainage Water Re-use Plantings of Jose Tall Wheatgrass
  • Dennis Falaschi: San Joaquin River Salinity Management Program
  • Dennis Falaschi: Information Sheet - Salt Balance Within the San Joaquin River Water Quality Improvement Project
  • Jason Peltier: California's climate and land use zones
  • David Orth: Groundwater Management in the Kings Service Area
  • Chase Hurley: San Joaquin River Exchange Contractors Water Authority
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Video May 22, 2014

Shaping of the West: 100 Years of Reclamation

30-minute DVD that traces the history of the U.S. Bureau of Reclamation and its role in the development of the West. Includes extensive historic footage of farming and the construction of dams and other water projects, and discusses historic and modern day issues.

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Maps & Posters May 20, 2014

Water Cycle Poster

Water as a renewable resource is depicted in this 18×24 inch poster. Water is renewed again and again by the natural hydrologic cycle where water evaporates, transpires from plants, rises to form clouds, and returns to the earth as precipitation. Excellent for elementary school classroom use.

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Maps & Posters May 20, 2014

California Water Map, Spanish

Spanish language version of our California Water Map

Versión en español de nuestro mapa de agua de California

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Publication May 20, 2014

Layperson’s Guide to the Central Valley Project
Updated 2021

The 24-page Layperson’s Guide to the Central Valley Project explores the history and development of the federal Central Valley Project (CVP), California’s largest surface water delivery system. In addition to the project’s history, the guide describes the various facilities, operations and benefits the water project brings to the state along with the CVP Improvement Act (CVPIA).

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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.

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

San Luis Reservoir

Aerial view of San Luis Reservoir

The San Luis Reservoir is the nation’s largest off-stream reservoir, serving as a key water facility for both the State Water Project (SWP) and the federal Central Valley Project (CVP).

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Water Academy

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