Tappan Lake, OH

As of 2026-10-13, Tappan Lake sits at 899.14 ft, which is above average for this time of year. That is 0.16 ft below full pool of 899.30 ft. Over the past 30 days the level has fallen 0.25 ft.

The most recent reading at Tappan Lake is 899.14 ft (2026-10-13), sourced from the U.S. Army Corps of Engineers. Readings on this page refresh automatically as the agency publishes new data.

The highest level for Tappan Lake in our records is 903.64 ft on 2024-04-07. The lowest is 891.21 ft on 2022-02-10. Our record covers about 6 years of readings.

Compared with every October in our records, the current level is higher than 76% of them, which we classify as above average 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.

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 fallen 0.25 ft over the past 30 days. For the operational reason on any given week, check the U.S. Army Corps of Engineers directly.

Tappan Lake is +0.61 ft compared with this date last year (899.14 ft today). The full-history chart above covers 6 years, with a record high of 903.64 ft and a record low of 891.21 ft.