58.87 ft NAVD88
level Current reading shown; this gauge's public record is too short for seasonal comparisons.
Reading comes straight from U.S. Geological Survey National Water Information System (USGS gauge 01661499) and updates live when you load this page.
Full pool, datum, and the gauge
"Full pool" here means the conservation pool — the level the lake is designed to hold for water supply and recreation, not the flood-control space above it. The full explainer covers flood pool and dead pool too.
| Full pool | not published by the operator |
|---|---|
| Gauge | USGS gauge 01661499 · U.S. Geological Survey National Water Information System |
| Datum | NAVD88 — No full-pool figure is published for this impoundment, so the page shows the gauge reading against the lake's own record. |
| Last verified | August 26, 2026 |
LakeDates reports lake level, not ramp status. Whether a given ramp or marina is usable at this level varies ramp by ramp — call the marina before you tow.
Quick answers
What is the lake level for St. Mary's Lake today?
St. Mary's Lake is at 58.87 ft (NAVD88) as of August 26, 2026 — Current reading shown; this gauge's public record is too short for seasonal comparisons.
Is St. Mary's Lake full?
Maryland impoundment; USGS gauge near Callaway doesn't publish a conservation-pool figure for St. Mary's Lake, so this page shows the latest reading straight from the gauge.
What is full pool for St. Mary's Lake?
Maryland impoundment; USGS gauge near Callaway doesn't publish a single conservation-pool elevation for St. Mary's Lake. The reading above comes straight from the operator's gauge.