Tioga Lake at Tioga Dam at Tioga water level

Name: Tioga Lake at Tioga Dam at Tioga water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

Reservoir, Tioga Lake, Pennsylvania, United States

Directions

Normal for late October

Surface elevation

1,081.31ft Down 0.05 ft over the last 24 hours

Measured Oct 21, 2026, 01:00 AM EDT (28 min ago)

History

What this means

Tioga Lake at Tioga Dam at Tioga is at 1,081.31 ft, in the normal range for late October.

The median for late October is 1,081.33 ft, based on 7 years of readings, so the lake level is 0.02 ft below typical. On the same day last year the reading was 1,080.92 ft, a difference of +0.39 ft.

It has dropped 0.05 ft over the past 24 hours. In the last month it has stayed between 1,081.11 ft and 1,081.59 ft.

Many reservoirs are drawn down through summer and fall; most of the refill comes later, with winter rain or spring snowmelt.

Compared with 7 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 1,081.33 ft0.02 ft below the median for this date
Normal for this date: 1,076.83 ft – 1,081.57 ft8 years in 10 fall in this range (7 years of records)
Same day last year: 1,080.92 ft+0.39 ft
Lowest and highest in 30 days: 1,081.11 ft – 1,081.59 ft
Lowest and highest in 12 months: 1,080.44 ft – 1,085.12 ft

On the water at Tioga Lake at Tioga Dam at Tioga

Normal levels mean few surprises on the water: ramps in use and the shoreline where you expect it.

Wear a life jacket on the water. Most boating deaths involve people who were not wearing one.

Weather at the gauge

No rain in the last 3 days.

20 Tue 65° 37° – Wind 11 mph

21 Wed 60° 35° – Wind 5 mph

22 Thu 59° 36° – Wind 12 mph

23 Fri 54° 34° – Wind 7 mph

24 Sat 58° 34° – Wind 5 mph

25 Sun 62° 36° – Wind 8 mph

26 Mon 66° 43° – Wind 5 mph

Forecast: Open-Meteo

Sunrise 07:28 AM Sunset 06:19 PM Daylight 10 hr, 51 min Waxing gibbous 74%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Hammond Lake at Hammond Dam at TiogaReservoir, Hammond Lake	1,086.26 ft	Normal	−0.02 ft	0.4 mi
Tioga River at TiogaRiver gauge, Tioga River	75.7 cfs	Normal	−14.3 cfs	0.8 mi
Tioga River at Tioga JunctionRiver gauge, Tioga River	6.81 ft	Below flood stage	−0.07 ft	3.9 mi
Cowanesque Lake at LawrencevilleLake, Cowanesque Lake	1,080.38 ft	Normal	±0	5.9 mi
Cowanesque River near LawrencevilleRiver gauge, Cowanesque River	7.27 ft	Below flood stage	+0.01 ft	7 mi
Tioga River near MansfieldRiver gauge, Tioga River	−0.03 ft	Below flood stage	−0.05 ft	8 mi
Crooked Cr below Catlin Hollow at Middlebury CenterRiver gauge, Crooked Cr	12.9 cfs	Normal	±0	8 mi
Tioga River at LindleyRiver gauge, Tioga River	3.14 ft	Below flood stage	−0.07 ft	9 mi

Questions and answers

Is Tioga Lake at Tioga Dam at Tioga higher than last year?

Yes, it is 0.39 ft higher than on the same day last year, when the reading was 1,080.92 ft.

What is a normal level for Tioga Lake at Tioga Dam at Tioga in late October?

The median for late October is 1,081.33 ft. In 8 years out of 10 the reading falls between 1,076.83 ft and 1,081.57 ft, based on 7 years of records.

Is Tioga Lake at Tioga Dam at Tioga really 1,081.31 ft deep?

No. 1,081.31 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Tioga Lake at Tioga Dam at Tioga today?

On Oct 21, 2026, 01:00 AM EDT, the surface elevation was 1,081.31 ft. Down 0.05 ft over the last 24 hours.

Is Tioga Lake at Tioga Dam at Tioga rising or falling?

Down 0.05 ft over the last 24 hours. Steady over the last 7 days.

Is the level of Tioga Lake at Tioga Dam at Tioga normal?

Normal for late October. Compared with 7 years of daily readings for this time of year.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:01517900 (Agency page)
Coordinates: 41.89924, -77.13886 (WGS84)
Vertical datum: local
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Surface elevation	1,081.31 ft	2026-10-21 05:00	Provisional

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How to cite

U.S. Geological Survey: Tioga Lake at Tioga Dam at Tioga (usgs:01517900). Accessed October 21, 2026 via Nivelmap, https://nivelmap.com/en/united-states/pennsylvania/tioga-lake-at-tioga-dam-at-tioga

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer