California’s largest reservoir gets water level update

Lake Shasta, California’s largest reservoir, has started declining after reaching a significant milestone of recovering to near full capacity for the third year in a row after years of critically low levels during the state’s prolonged drought.

Once a symbol of California’s deepening water crisis, Lake Shasta now reflects the state’s hydrological rebound, with recent data showing the reservoir at approximately 96 percent of its total capacity and 114 percent of its historical average for early May.

Why It Matters

Lake Shasta is a linchpin in California’s water system, supplying water to millions of people and supporting agriculture across the Central Valley. When it runs dry, ripple effects stretch across the Golden State. Its resurgence is both a sign of temporary relief and a benchmark for statewide water resilience. As droughts become more frequent and severe under climate change projections, the lake’s level is closely watched by water managers and residents alike.

What To Know

After peaking at 1,062.02 feet in elevation a week ago, Lake Shasta’s water levels have gradually started to decline, marking the end of the five-month rise that began in late November.

Only a week after levels peaked, California’s biggest reservoir has lost roughly a foot of water. As of Monday, the lake’s elevation was 1,061.07 feet, nearly 6 feet below full capacity.

Despite its falling water levels, the lake is in a similar place as it was in 2023 and 2024 after above-average precipitation during the winter supplemented the levels. It is typical for Lake Shasta’s water levels to begin declining in early May. The water levels declined throughout the summer months during the past two years before rising in the fall.

In 2022, Lake Shasta hit critically low levels when it dropped to just 40 percent capacity. During the most severe years of drought, particularly from 2020 through 2022, the reservoir’s water levels dropped dramatically, exposing swaths of the lakebed and causing widespread concern over water supplies across the state.

The dramatic turnaround began during the 2022-2023 winter, one of the wettest in California’s recent history with snowpack more than 200 percent above average. Intense atmospheric rivers and heavy snowpack accumulation across the Sierra Nevada and surrounding watersheds helped fill Lake Shasta at a record pace.

Hydrologists credit the lake’s recovery to not just one wet year but a consistent trend of above-average precipitation. According to the California Department of Water Resources (DWR), the state’s snowpack has been at or above average for three consecutive years—2023, 2024, and 2025. This snowpack serves as a critical source of runoff for California’s reservoirs in the spring and summer months.

Many of California’s other reservoirs, including Lake Oroville, also are performing well.

What People Are Saying

A United States Bureau of Reclamation (USBR) spokesperson told Newsweek: “We reached [peak] elevation on April 28th at 1062.02 elevation and 4.98 feet from capacity.”

Extreme weather chaser Colin McCarthy posted on X, formerly Twitter, on April 30: “California’s largest reservoir, Shasta Lake, is virtually full for the third straight year. The reservoir holds nearly 1.5 trillion gallons of water, which is enough to cover the entire state of California in half an inch of water.”

What Happens Next?

Given trends, Lake Shasta will likely continue declining until the wet season returns in October. While the recovery is promising, seasonal rainfall can fluctuate dramatically, increasing pressure on California’s water infrastructure.