Diablo Reservoir Water Level History
Thirty-day lake-level chart, recent highs and lows, net change and daily summaries from the matched USGS station.
Diablo Reservoir water-level chart
Source: U.S. Geological Survey monitoring station ↗. Recent measurements may be provisional.
What has Diablo Reservoir been doing?
Across the available 30-day series, Diablo Reservoir is falling overall. The measured range runs from 1,198.95 ft to 1,203 ft, with a net change of -0.68 ft.
Lake levels can respond to rainfall, watershed inflow, dam and hydropower operations, seasonal target elevations, evaporation and downstream release requirements. This page reports what the matched sensor measured; it does not infer why an operator changed a reservoir.
Recent daily levels
| Date | Low | Average | High |
|---|---|---|---|
| Oct 7 | 1201.17 ft | 1201.26 ft | 1201.35 ft |
| Oct 6 | 1200.64 ft | 1200.94 ft | 1201.28 ft |
| Oct 5 | 1200.94 ft | 1201.61 ft | 1202.10 ft |
| Oct 4 | 1201.19 ft | 1202.10 ft | 1202.95 ft |
| Oct 3 | 1201.14 ft | 1201.93 ft | 1202.63 ft |
| Oct 2 | 1200.12 ft | 1200.88 ft | 1201.63 ft |
| Oct 1 | 1200.01 ft | 1200.85 ft | 1201.74 ft |
| Sep 30 | 1201.23 ft | 1202.08 ft | 1202.70 ft |
| Sep 29 | 1201.29 ft | 1201.79 ft | 1202.34 ft |
| Sep 28 | 1200.66 ft | 1201.08 ft | 1201.83 ft |
| Sep 27 | 1200.92 ft | 1201.05 ft | 1201.25 ft |
| Sep 26 | 1200.49 ft | 1200.71 ft | 1201.07 ft |
| Sep 25 | 1200.57 ft | 1201.44 ft | 1202.16 ft |
| Sep 24 | 1202.20 ft | 1202.58 ft | 1202.91 ft |
| Sep 23 | 1201.77 ft | 1202.43 ft | 1203.00 ft |
| Sep 22 | 1200.15 ft | 1200.66 ft | 1201.55 ft |
| Sep 21 | 1199.76 ft | 1200.23 ft | 1200.63 ft |
| Sep 20 | 1199.36 ft | 1199.63 ft | 1200.02 ft |
| Sep 19 | 1198.95 ft | 1199.44 ft | 1200.22 ft |
| Sep 18 | 1200.18 ft | 1200.39 ft | 1200.61 ft |
| Sep 17 | 1199.39 ft | 1200.02 ft | 1200.58 ft |
| Sep 16 | 1199.38 ft | 1200.83 ft | 1201.85 ft |
| Sep 15 | 1201.45 ft | 1202.03 ft | 1202.57 ft |
| Sep 14 | 1199.28 ft | 1200.26 ft | 1201.21 ft |
| Sep 13 | 1200.48 ft | 1201.46 ft | 1202.23 ft |
| Sep 12 | 1201.58 ft | 1202.03 ft | 1202.54 ft |
| Sep 11 | 1201.27 ft | 1201.94 ft | 1202.68 ft |
| Sep 10 | 1201.51 ft | 1202.45 ft | 1202.71 ft |
| Sep 9 | 1201.03 ft | 1201.25 ft | 1201.48 ft |
| Sep 8 | 1200.66 ft | 1201.34 ft | 1202.16 ft |
Diablo Reservoir level-history FAQ
How has Diablo Reservoir water level changed over the last 30 days?
Across the available 30-day sensor series, the net change is -0.68 ft and the overall direction is falling.
What was the highest Diablo Reservoir level in the last 30 days?
The highest reading in the available 30-day series is 1,203 ft.
What was the lowest Diablo Reservoir level in the last 30 days?
The lowest reading in the available 30-day series is 1,198.95 ft.
Are historical USGS lake readings final?
Not always. Recent readings may be marked provisional and can be revised by the source agency after quality review.