Allegheny Reservoir Water Level
Pennsylvania · updated daily from the U.S. Geological Survey
1327.01 ft
Allegheny Reservoir is above average for this time of year and rising (+0.45 ft in the last 7 days).
Change since yesterday: +0.05 ft
Reading as of 2026-08-14 · higher than 67% of August readings on record
Where Allegheny Reservoir sits historically
Today's level compared with every reading in our 10.9-year record for this lake.
Since yesterday
+0.05 ft
7-day change
+0.45 ft
30-day change
-0.19 ft
1-year change
+2.42 ft
Last 30 days
Last 12 months
Full history (10.9 years)
Allegheny Reservoir records and averages
| Current level | 1327.01 ft |
|---|---|
| Record high | 1340.49 ft (2024-04-16) |
| Record low | 1296.42 ft (2025-10-30) |
| Average of all readings | 1318.69 ft |
| Data span | 10.9 years (3,941 readings) |
Frequently asked questions
Is Allegheny Reservoir full right now?
As of 2026-08-14, Allegheny Reservoir sits at 1327.01 ft, which is above average for this time of year.Over the past 30 days the level has fallen 0.19 ft.
What is the water level at Allegheny Reservoir today?
The most recent reading is 1327.01 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 Allegheny Reservoir has ever been?
The highest level in our records is 1340.49 ft on 2024-04-16. The lowest is 1296.42 ft on 2025-10-30. Our record covers about 10.9 years of readings.
Is Allegheny Reservoir low for this time of year?
Compared with every August in our records, the current level is higher than 67% of them — 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.
Why is Allegheny Reservoir 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. Allegheny Reservoir has fallen 0.19 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Allegheny Reservoir changed over the past year?
The level is +2.42 ft compared with this date last year (1327.01 ft today). The full-history chart above covers 10.9 years, with a record high of 1340.49 ft and a record low of 1296.42 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.