What is the current water level of Lake Tappan at Old Tappan?

As of Jul 14, 2026, 1:30 PM (UTC-04:00), the pool elevation was 54.97 ft (datum NGVD29), provisional and subject to revision. See the trend chart above for the recent direction.

Is Lake Tappan at Old Tappan full right now?

Its managing agency does not publish a %-of-conservation-pool-full figure for this lake, so we show the bare level rather than estimate one.

Where does this data come from?

From USGS site 01376950, retrieved Jul 14, 2026, 10:55 PM (UTC+00:00). See the official link and the methodology page for the full source and update cadence.

Is this safe to use for boating or navigation?

No. Levels here are provisional readings for general reference only — not for navigation, dam-safety, or other safety decisions. Always confirm current conditions with the managing agency before making those calls.

Lake Tappan at Old Tappan water level — New Jersey

New Jersey · USGS · reading Jul 14, 2026, 1:30 PM (UTC-04:00) Provisional

Lake Tappan at Old Tappan in New Jersey was last measured at 54.97 ft (datum NGVD29), as of Jul 14, 2026, 1:30 PM (UTC-04:00) (USGS Water Services). Over its recent trend window the level has been rising (+0.2 ft). This reading is provisional and subject to revision. Figures are provisional readings for reference — not for navigation or safety decisions.

Current reading Lake Tappan at Old Tappan · New Jersey

Pool elevation: 54.97 ft
% of conservation pool full: Not reported
Storage: Not reported
Recent trend: ↑Rising

Recent trend

The last ~90 days of readings at this station, downsampled for display.

Data: USGS Water Services (waterservices.usgs.gov) and USACE CWMS Data (cwms-data.usace.army.mil), retrieved 2026-07-14. Both public domain (a work of the U.S. Government, 17 U.S.C. §105).

Important — not for navigation or safety decisions

Water levels here are provisional readings for general reference only. Conditions vary and readings can be revised. Always confirm current conditions with the managing agency before making navigation, boating, or dam-safety decisions.

Source: USGS site 01376950, retrieved Jul 14, 2026, 10:55 PM (UTC+00:00). Official page for this lake →

Nearby lakes

The six nearest published lakes by centroid distance (great-circle) — cross-state neighbors included.

Lakes nearest to Lake Tappan at Old Tappan, with current level and distance.
Lake	State	Level	Distance
Woodcliff Lake at Hillsdale	NJ	93.19 ft	4 km
Oradell Reservoir at Oradell	NJ	15.47 ft	7 km
Wanaque Reservoir at Wanaque	NJ	294.66 ft	25 km
Greenwood Lake at Awosting	NJ	618.53 ft	32 km
Boonton Reservoir at Boonton	NJ	304.61 ft	36 km
Baisley Pond at South Ozone Park	NY	5.63 ft	42 km

Frequently asked questions

What is the current water level of Lake Tappan at Old Tappan?: As of Jul 14, 2026, 1:30 PM (UTC-04:00), the pool elevation was 54.97 ft (datum NGVD29), provisional and subject to revision. See the trend chart above for the recent direction.
Is Lake Tappan at Old Tappan full right now?: Its managing agency does not publish a %-of-conservation-pool-full figure for this lake, so we show the bare level rather than estimate one.
Where does this data come from?: From USGS site 01376950, retrieved Jul 14, 2026, 10:55 PM (UTC+00:00). See the official link and the methodology page for the full source and update cadence.
Is this safe to use for boating or navigation?: No. Levels here are provisional readings for general reference only — not for navigation, dam-safety, or other safety decisions. Always confirm current conditions with the managing agency before making those calls.

More in New Jersey

See every lake tracked in New Jersey, or read the methodology behind these figures.