Diablo Reservoir Water Level
Washington · updated daily from the U.S. Geological Survey
1201.46 ft
Diablo Reservoir is current reading available and falling (-0.63 ft in the last 7 days).
Change since yesterday: +0.26 ft
Reading as of 2026-08-15
Where Diablo Reservoir sits historically
Today's level compared with every reading in our 0.3-year record for this lake.
Since yesterday
+0.26 ft
7-day change
-0.63 ft
30-day change
+0.08 ft
1-year change
— ft
Last 30 days
Last 12 months
Diablo Reservoir records and averages
| Current level | 1201.46 ft |
|---|---|
| Record high | 1204.46 ft (2026-05-06) |
| Record low | 1197.8 ft (2026-05-17) |
| Average of all readings | 1201.76 ft |
| Data span | 0.3 years (121 readings) |
Frequently asked questions
Is Diablo Reservoir full right now?
As of 2026-08-15, Diablo Reservoir sits at 1201.46 ft, which is current reading available.Over the past 30 days the level has risen 0.08 ft.
What is the water level at Diablo Reservoir today?
The most recent reading is 1201.46 ft (2026-08-15), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Diablo Reservoir has ever been?
The highest level in our records is 1204.46 ft on 2026-05-06. The lowest is 1197.8 ft on 2026-05-17. Our record covers about 0.3 years of readings.
Why is Diablo Reservoir low right now?
Reservoir levels move for four main reasons: rainfall and runoff into the basin, releases through the dam for downstream water supply, power generation or flood control, evaporation during hot months, and seasonal drawdown schedules set by the operating agency. Diablo Reservoir has risen 0.08 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Diablo Reservoir changed over the past year?
Year-over-year comparison is not available for this lake yet. The full-history chart above covers 0.3 years, with a record high of 1204.46 ft and a record low of 1197.8 ft.
Nearby lakes in Washington
Source: the U.S. Geological Survey. Readings are provisional and subject to revision by the publishing agency. All Washington lake levels.