Prompton Reservoir Water Level
Pennsylvania · updated daily from the U.S. Geological Survey
1124.02 ft
Prompton Reservoir is about average for this time of year and steady (+0.13 ft in the last 7 days).
Change since yesterday: +0.01 ft
Reading as of 2026-08-14 · higher than 46% of August readings on record
Where Prompton Reservoir sits historically
Today's level compared with every reading in our 40.4-year record for this lake.
Since yesterday
+0.01 ft
7-day change
+0.13 ft
30-day change
-0.05 ft
1-year change
+0.43 ft
Last 30 days
Last 12 months
Full history (40.4 years)
Prompton Reservoir records and averages
| Current level | 1124.02 ft |
|---|---|
| Record high | 1133.28 ft (2022-04-08) |
| Record low | 2.99 ft (1988-08-23) |
| Average of all readings | 900.78 ft |
| Data span | 40.4 years (4,388 readings) |
Frequently asked questions
Is Prompton Reservoir full right now?
As of 2026-08-14, Prompton Reservoir sits at 1124.02 ft, which is about average for this time of year.Over the past 30 days the level has fallen 0.05 ft.
What is the water level at Prompton Reservoir today?
The most recent reading is 1124.02 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 Prompton Reservoir has ever been?
The highest level in our records is 1133.28 ft on 2022-04-08. The lowest is 2.99 ft on 1988-08-23. Our record covers about 40.4 years of readings.
Is Prompton Reservoir low for this time of year?
Compared with every August in our records, the current level is higher than 46% of them — about 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 Prompton 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. Prompton Reservoir has fallen 0.05 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has Prompton Reservoir changed over the past year?
The level is +0.43 ft compared with this date last year (1124.02 ft today). The full-history chart above covers 40.4 years, with a record high of 1133.28 ft and a record low of 2.99 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.