Tappan Lake Water Level History
Thirty-day lake-level chart, recent highs and lows, net change and daily summaries from the matched USGS station.
Tappan Lake water-level chart
Source: U.S. Geological Survey monitoring station ↗. Recent measurements may be provisional.
What has Tappan Lake been doing?
Across the available 30-day series, Tappan Lake is falling overall. The measured range runs from 899.14 ft to 899.43 ft, with a net change of -0.22 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 8 | 899.14 ft | 899.15 ft | 899.16 ft |
| Oct 7 | 899.16 ft | 899.17 ft | 899.17 ft |
| Oct 6 | 899.17 ft | 899.18 ft | 899.19 ft |
| Oct 5 | 899.19 ft | 899.20 ft | 899.21 ft |
| Oct 4 | 899.21 ft | 899.22 ft | 899.22 ft |
| Oct 3 | 899.22 ft | 899.23 ft | 899.23 ft |
| Oct 2 | 899.22 ft | 899.23 ft | 899.23 ft |
| Oct 1 | 899.23 ft | 899.24 ft | 899.24 ft |
| Sep 30 | 899.24 ft | 899.25 ft | 899.25 ft |
| Sep 29 | 899.25 ft | 899.25 ft | 899.25 ft |
| Sep 28 | 899.25 ft | 899.26 ft | 899.27 ft |
| Sep 27 | 899.27 ft | 899.28 ft | 899.30 ft |
| Sep 26 | 899.30 ft | 899.31 ft | 899.32 ft |
| Sep 25 | 899.32 ft | 899.34 ft | 899.35 ft |
| Sep 24 | 899.35 ft | 899.36 ft | 899.37 ft |
| Sep 23 | 899.37 ft | 899.38 ft | 899.38 ft |
| Sep 22 | 899.37 ft | 899.38 ft | 899.38 ft |
| Sep 21 | 899.35 ft | 899.36 ft | 899.37 ft |
| Sep 20 | 899.32 ft | 899.33 ft | 899.35 ft |
| Sep 19 | 899.32 ft | 899.33 ft | 899.34 ft |
| Sep 18 | 899.34 ft | 899.35 ft | 899.36 ft |
| Sep 17 | 899.33 ft | 899.35 ft | 899.36 ft |
| Sep 16 | 899.33 ft | 899.34 ft | 899.35 ft |
| Sep 15 | 899.35 ft | 899.37 ft | 899.39 ft |
| Sep 14 | 899.39 ft | 899.39 ft | 899.39 ft |
| Sep 13 | 899.39 ft | 899.39 ft | 899.40 ft |
| Sep 12 | 899.40 ft | 899.41 ft | 899.42 ft |
| Sep 11 | 899.42 ft | 899.43 ft | 899.43 ft |
| Sep 10 | 899.34 ft | 899.39 ft | 899.42 ft |
| Sep 9 | 899.35 ft | 899.35 ft | 899.36 ft |
Tappan Lake level-history FAQ
How has Tappan Lake water level changed over the last 30 days?
Across the available 30-day sensor series, the net change is -0.22 ft and the overall direction is falling.
What was the highest Tappan Lake level in the last 30 days?
The highest reading in the available 30-day series is 899.43 ft.
What was the lowest Tappan Lake level in the last 30 days?
The lowest reading in the available 30-day series is 899.14 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.