Lake Oroville Water Levels Have Declined

The California reservoir has dropped to 47 percent of its total capacity as outflow continues to outpace inflow.

Updated on Oct. 5, 2026 in Current Conditions

Isometric editorial illustration showing a reservoir dam with large terraced shoreline layers, depicting the reduced water capacity in a dry landscape. — Lake Oroville's water levels have dropped to 47 percent of capacity following a prolonged dry spell that began in early spring. AI Illustration. Upload story photo >

Live Poll

Do you trust that your local water supply is adequately protected against prolonged dry spells?

Lake Oroville water levels have fallen to 47 percent of total capacity following a long dry spell that began in early spring. The reservoir has seen a decline of roughly 145 feet since reaching near-full levels in mid-May.

Why it matters

The reservoir manages water for millions of Californians, farms, and environmental needs, including Feather River salmon. Releases are currently being prioritized to maintain flood control space and ensure quality in the Delta.

The reservoir is at 752 feet in elevation, with an inflow rate of 2,400 cubic feet per second against an outflow of 9,200 cubic feet per second. This current outflow contributes to a daily surface level drop of approximately 1.5 feet.

The players

Department of Water Resources

This state agency is responsible for the management and protection of California's water resources.

The details

Water is being released to support cities, agricultural land, and to meet water quality requirements for the Delta. The Department of Water Resources maintains this operational space for flood control through the month of June.

Mid-May 2026: Lake Oroville was at 99 percent capacity.
September 23, 2026: The lake dropped to 50 percent of capacity.
September 28, 2026: Federal reservoir data was recorded.
October 2026: The lake is at 47 percent of capacity.
2021: The record low elevation of 628 feet was established.

Seasonal Patterns

While current levels are low, they remain above the historical record low of 628 feet set in 2021. The reservoir is now following a decline pattern consistent with historical flood control management cycles.

Residents should stay informed on local water management policies as the State Water Project continues to serve 27 million Californians. Authorities are currently managing flows to balance supply needs for farms and cities across the region.

The takeaway

Climate models currently favor a wet winter, which may help mitigate ongoing drought impacts. Monitoring official reservoir data remains the best way to track potential changes in water availability for the state.