DWR Updates

A drone photo shows the California Department of Water Resources’ bioacoustic fish fence installed at the junction of the Sacramento River, right, and Georgiana Slough at Walnut Grove in Sacramento County, California. Photo taken November 30, 2023.

Video: Georgiana Slough Effectiveness Study

DWR is leading the Georgiana Slough Effectiveness Study in partnership with UC Davis.

Published: March 02, 2026

A scenic view of the Roy Rogers Trail near Loafer Creek in Butte County, California. Photo taken July 14, 2025.

Lake Oroville Update - February 27, 2026

Published: February 27, 2026

Delta smelt are raised at the UC Davis Fish Conservation and Culture Laboratory in Contra Costa County, California, to be released into the Sacramento-San Joaquin Delta to support the wild population. Photo taken January 8, 2025.

Little Fish, Big Decisions: How Science Guides Actions in the Delta

California’s water system is one of the most complex and important in the world. It delivers water to millions of people across the state and supports ecosystems that are vital to California’s environmental health.

Published: February 23, 2026

An aerial view of a designated brood pond area at the Thermalito Afterbay. Water surrounds two small, vegetated islands.

Lake Oroville Update - February 20, 2026

Published: February 20, 2026

Amelia Ayers, a Physical Scientist with the U.S. Geological Survey, packs up gear used to gather shellfish samples collected at Martinez Harbor, Contra Costa County. The shrimp are tested for levels of toxins found in Harmful Algal Blooms (HABs). The work is part of a five-year, $3 million grant for the Monitoring and Event Response for Harmful Algal Blooms (MERHAB) research program, a focused effort co-lead by DWR. A comprehensive and focused effort co-lead by DWR, MERHAB is focused on building an estuary-wide management strategy for HABs. Xavier Mascareñas / California Department of Water Resources

DWR Partners with Agencies to Untangle Mystery of California's Harmful Algal Blooms

Appearing like something out of science fiction, harmful algal blooms (HABs) can form thick mats that accumulate on freshwater surfaces throughout California.

Published: February 19, 2026

A windy stretch of the East Branch California Aqueduct in Palmdale, California, located in Los Angeles County near mile post 327.50 on May 12, 2023.

The State Water Project - Beyond the Tap

The State Water Project was developed in the 1960s to support the California economy.

Published: February 17, 2026

Driftwood is collected and towed in pods with boats throughout Lake Oroville in Butte County, California. Photo taken March 7, 2023.

Lake Oroville Update - February 13, 2026

Published: February 13, 2026

CDFW staff use a long pipe to plant steelhead trout in Mile Long Pond at the Oroville Wildlife Area.

Lake Oroville Update- February 6, 2026

Published: February 06, 2026

Fuel load management work, including controlled burns, is conducted by CalFire in conjunction with California Department of Water Resources at Loafer Creek State Recreation Area in Oroville, California. Photo taken March 2, 2022

Lake Oroville Update - January 30, 2026

Published: January 30, 2026

California Department of Water Resources Engineer Jacob Kollen (left) and Engineer Anthony Burdock conduct the first media snow survey of the 2026 season at Phillips Station in the Sierra Nevada. The snow survey is held approximately 90 miles east of Sacramento off Highway 50 in El Dorado County. Photo taken December 30, 2026.

Video: State Water Project Allocation Process

Each year, the State Water Project uses several factors to determine how much water it can deliver to water contractors. One factor that guides those decisions is snow surveys. Watch to learn more.

Published: January 29, 2026

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