Tioga Lake Water Level
Pennsylvania · updated daily from the U.S. Geological Survey
1081.55 ft
Tioga Lake is high for this time of year and rising (+0.21 ft in the last 7 days).
Change since yesterday: +0.02 ft
Reading as of 2026-08-14 · higher than 82% of August readings on record
Where Tioga Lake sits historically
Today's level compared with every reading in our 9.9-year record for this lake.
Since yesterday
+0.02 ft
7-day change
+0.21 ft
30-day change
+0.07 ft
1-year change
+0.08 ft
Last 30 days
Last 12 months
Full history (9.9 years)
Tioga Lake records and averages
| Current level | 1081.55 ft |
|---|---|
| Record high | 1103.74 ft (2020-12-26) |
| Record low | 1076.62 ft (2020-10-19) |
| Average of all readings | 1082.05 ft |
| Data span | 9.9 years (3,603 readings) |
Frequently asked questions
Is Tioga Lake full right now?
As of 2026-08-14, Tioga Lake sits at 1081.55 ft, which is high for this time of year.Over the past 30 days the level has risen 0.07 ft.
What is the water level at Tioga Lake today?
The most recent reading is 1081.55 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 Tioga Lake has ever been?
The highest level in our records is 1103.74 ft on 2020-12-26. The lowest is 1076.62 ft on 2020-10-19. Our record covers about 9.9 years of readings.
Is Tioga Lake low for this time of year?
Compared with every August in our records, the current level is higher than 82% 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 Tioga 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. Tioga Lake has risen 0.07 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Tioga Lake changed over the past year?
The level is +0.08 ft compared with this date last year (1081.55 ft today). The full-history chart above covers 9.9 years, with a record high of 1103.74 ft and a record low of 1076.62 ft.
Nearby lakes in Pennsylvania
Source: the U.S. Geological Survey. Readings are provisional and subject to revision by the publishing agency. All Pennsylvania lake levels.