Pomona Lake Water Level History
Thirty-day lake-level chart, recent highs and lows, net change and daily summaries from the matched USGS station.
Pomona Lake water-level chart
Source: U.S. Geological Survey monitoring station ↗. Recent measurements may be provisional.
What has Pomona Lake been doing?
Across the available 30-day series, Pomona Lake is rising overall. The measured range runs from 973.78 ft to 978.96 ft, with a net change of +1.45 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 | 975.34 ft | 975.60 ft | 975.87 ft |
| Oct 6 | 975.87 ft | 976.35 ft | 976.83 ft |
| Oct 5 | 976.84 ft | 977.30 ft | 977.75 ft |
| Oct 4 | 977.77 ft | 978.20 ft | 978.61 ft |
| Oct 3 | 978.62 ft | 978.86 ft | 978.96 ft |
| Oct 2 | 976.06 ft | 978.01 ft | 978.85 ft |
| Oct 1 | 974.75 ft | 974.96 ft | 975.99 ft |
| Sep 30 | 974.62 ft | 974.66 ft | 974.75 ft |
| Sep 29 | 974.59 ft | 974.61 ft | 974.65 ft |
| Sep 28 | 974.57 ft | 974.60 ft | 974.61 ft |
| Sep 27 | 974.60 ft | 974.60 ft | 974.61 ft |
| Sep 26 | 974.56 ft | 974.60 ft | 974.62 ft |
| Sep 25 | 974.54 ft | 974.57 ft | 974.59 ft |
| Sep 24 | 974.55 ft | 974.57 ft | 974.59 ft |
| Sep 23 | 974.58 ft | 974.60 ft | 974.61 ft |
| Sep 22 | 974.61 ft | 974.62 ft | 974.63 ft |
| Sep 21 | 974.63 ft | 974.64 ft | 974.66 ft |
| Sep 20 | 974.62 ft | 974.66 ft | 974.68 ft |
| Sep 19 | 974.62 ft | 974.64 ft | 974.69 ft |
| Sep 18 | 974.62 ft | 974.63 ft | 974.65 ft |
| Sep 17 | 974.44 ft | 974.56 ft | 974.62 ft |
| Sep 16 | 973.90 ft | 974.14 ft | 974.43 ft |
| Sep 15 | 973.80 ft | 973.85 ft | 973.94 ft |
| Sep 14 | 973.81 ft | 973.85 ft | 973.88 ft |
| Sep 13 | 973.86 ft | 973.89 ft | 973.93 ft |
| Sep 12 | 973.86 ft | 973.91 ft | 974.05 ft |
| Sep 11 | 973.90 ft | 973.92 ft | 973.95 ft |
| Sep 10 | 973.84 ft | 973.95 ft | 973.98 ft |
| Sep 9 | 973.78 ft | 973.82 ft | 973.91 ft |
| Sep 8 | 973.82 ft | 973.84 ft | 973.88 ft |
Pomona Lake level-history FAQ
How has Pomona Lake water level changed over the last 30 days?
Across the available 30-day sensor series, the net change is +1.45 ft and the overall direction is rising.
What was the highest Pomona Lake level in the last 30 days?
The highest reading in the available 30-day series is 978.96 ft.
What was the lowest Pomona Lake level in the last 30 days?
The lowest reading in the available 30-day series is 973.78 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.