Tappan Lake Water Level
Ohio · updated daily from the U.S. Geological Survey
899.80 ft
Tappan Lake is high for this time of year and rising (+0.70 ft in the last 7 days).
Change since yesterday: +0.00 ft
Reading as of 2026-08-14 · higher than 95% of August readings on record
Where Tappan Lake sits historically
Today's level compared with every reading in our 5.0-year record for this lake.
Since yesterday
+0.00 ft
7-day change
+0.70 ft
30-day change
+0.41 ft
1-year change
+0.68 ft
Last 30 days
Last 12 months
Full history (5.0 years)
Tappan Lake records and averages
| Current level | 899.80 ft |
|---|---|
| Record high | 903.62 ft (2024-04-07) |
| Record low | 891.23 ft (2022-02-09) |
| Average of all readings | 897.63 ft |
| Data span | 5.0 years (1,819 readings) |
Frequently asked questions
Is Tappan Lake full right now?
As of 2026-08-14, Tappan Lake sits at 899.80 ft, which is high for this time of year.Over the past 30 days the level has risen 0.41 ft.
What is the water level at Tappan Lake today?
The most recent reading is 899.80 ft (2026-08-14), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
What is the highest Tappan Lake has ever been?
The highest level in our records is 903.62 ft on 2024-04-07. The lowest is 891.23 ft on 2022-02-09. Our record covers about 5.0 years of readings.
Is Tappan Lake low for this time of year?
Compared with every August in our records, the current level is higher than 95% of them — high for this time of year. Seasonal comparison matters more than the raw number, because most reservoirs draw down predictably through late summer and refill over winter and spring.
Why is Tappan Lake changing 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. Tappan Lake has risen 0.41 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Tappan Lake changed over the past year?
The level is +0.68 ft compared with this date last year (899.80 ft today). The full-history chart above covers 5.0 years, with a record high of 903.62 ft and a record low of 891.23 ft.
Nearby lakes in Ohio
Source: the U.S. Geological Survey. Readings are provisional and subject to revision by the publishing agency. All Ohio lake levels.