St Marys Lake Water Level
Maryland · updated daily from the U.S. Geological Survey
60.85 ft
St Marys Lake is current reading available and steady (-0.06 ft in the last 7 days).
Change since yesterday: +0.00 ft
Reading as of 2026-08-15
Where St Marys Lake sits historically
Today's level compared with every reading in our 0.3-year record for this lake.
Since yesterday
+0.00 ft
7-day change
-0.06 ft
30-day change
-0.17 ft
1-year change
— ft
Last 30 days
Last 12 months
St Marys Lake records and averages
| Current level | 60.85 ft |
|---|---|
| Record high | 61.31 ft (2026-07-13) |
| Record low | 60.66 ft (2026-07-06) |
| Average of all readings | 60.85 ft |
| Data span | 0.3 years (121 readings) |
Frequently asked questions
Is St Marys Lake full right now?
As of 2026-08-15, St Marys Lake sits at 60.85 ft, which is current reading available.Over the past 30 days the level has fallen 0.17 ft.
What is the water level at St Marys Lake today?
The most recent reading is 60.85 ft (2026-08-15), sourced from the U.S. Geological Survey. Readings on this page refresh automatically as the agency publishes new data.
What is the highest St Marys Lake has ever been?
The highest level in our records is 61.31 ft on 2026-07-13. The lowest is 60.66 ft on 2026-07-06. Our record covers about 0.3 years of readings.
Why is St Marys 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. St Marys Lake has fallen 0.17 ft over the past 30 days. For the operational reason on any given week, check the U.S. Geological Survey directly.
How much has St Marys Lake changed over the past year?
Year-over-year comparison is not available for this lake yet. The full-history chart above covers 0.3 years, with a record high of 61.31 ft and a record low of 60.66 ft.
Nearby lakes in Maryland
Source: the U.S. Geological Survey. Readings are provisional and subject to revision by the publishing agency. All Maryland lake levels.