Tappan Lake lake and shoreline

Tappan Lake Water Level

Officially Tappan Lake (Little Stillwater Creek)

Ohio

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Tappan Lake

Tappan Lake is currently 0.4 feet above full pool, with a water-surface elevation of 899.4 feet.

899.35 ft · Updated 5 hours ago · U.S. Geological Survey

Current level

899.35ft

+0.35 ft vs full pool

Normal

Vs full pool

Since last reading

No meaningful change

Previous readingSep 22899.37 ft

7-day change

Up 0.01 ft

7-day trend: Stable

8 daily readings in the last 7 days

30-day change

Down 0.43 ft

31 daily readings in the last 30 days

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Water Level History

Current
899.35 ft
24h
0.00 ft
7d
+0.01 ft
30d
-0.43 ft

Elevation (ft) NGVD29 · MSL

Reference line is designed full pool.

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Lake Level Context

Level remains above the full pool

Tappan Lake is currently 899.35 ft, 0.35 ft above its full pool. The lake has risen 0.01 ft over the past 7 days and fallen 0.43 ft over the past 30 days.

Tappan Lake Level Details

Reference elevations, recent daily readings, data sources, and answers to common questions.

Conditions & Reference

Level status

0.35 ft above full pool

Current level
899.35 ft
Full pool
899 ft
DatumElevation referenced to National Geodetic Vertical Datum of 1929.
NGVD29
Elevation reference
MSL
Source
USGS

Reference levels

  • Full pool899 ft

Daily level summary

DateLevelChange
Sep 23, 2026899.370
Sep 22, 2026899.37-0.01
Sep 21, 2026899.38+0.01
Sep 20, 2026899.37+0.04
Sep 19, 2026899.330
Sep 18, 2026899.33-0.02
Sep 17, 2026899.35-0.01

Common questions about Tappan Lake’s water level

  • The current water level at Tappan Lake is 899.35 ft (updated 5 hours ago). You can track the Tappan Lake lake level on the interactive chart and daily history above.

  • Full pool for Tappan Lake is 899 ft — the normal conservation target elevation when the reservoir is at its designed summer or operating pool.

  • Over the past seven days the Tappan Lake lake level has held relatively steady — the current 7-day trend is Stable. The history chart above shows the full trend.

  • Based on the latest gauge reading, Tappan Lake is currently 0.35 ft above full pool.

Lake level glossary

Definitions for pool targets, datums, and how elevation readings are labeled.

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