Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC). Fill % uses design capacity from the National Inventory of Dams where available; a few sites without a match fall back to the 5-year maximum.

About reservoirs in California

As of June 11, 2026, the reservoirs we track across California that report live levels hold roughly 28,823 hm³ of water — about 85.1% of their combined capacity. Taken together, California's reservoirs are high.

Across the region, 1 reservoir is at critically low levels and 1 is low. WARM SPRINGS (LAKE SONOMA) is the fullest at 105.0%, while BEAR is the lowest at 0.0%.

Over the most recent week on record, 1 reservoir fell across California.

Storage figures for California come from USGS · USACE · BOR · CDEC; the most recent reading is from June 11, 2026. Each reservoir below links to its own page with full history and seasonal context.

California at a glance

Reservoirs tracked: 32
Average fill: 85.1%
Water stored: 28,823 hm³
Combined capacity: 33,877 hm³
At critically low levels: 1
Fullest: WARM SPRINGS (LAKE SONOMA) (105.0%)
Lowest: BEAR (0.0%)
Last updated: June 11, 2026

Frequently asked questions

How full are reservoirs in California right now?

As of June 11, 2026, the reservoirs tracked in California that report live levels are 85.1% full overall, holding about 28,823 hm³ of water.

How many reservoirs are there in California?

reservoirs.earth tracks 32 reservoirs in California, with a combined storage capacity of 33,877 hm³.

Which reservoir in California is the fullest?

WARM SPRINGS (LAKE SONOMA) is currently the fullest reservoir in California, at 105.0% of capacity.

Which reservoir in California is the lowest?

BEAR is currently the lowest in California, at 0.0% of capacity.

Where does the reservoir data for California come from?

All storage figures for California come from USGS · USACE · BOR · CDEC, an official source, last updated June 11, 2026.

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