Blue Marsh Lake
Source: U.S. Geological Survey (Water Data for the Nation)
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Level history
Last 30 days of daily means.
Field notes
Blue Marsh Lake's latest daily level (Oct 25, 2026) is 286.59 (above gauge datum) ft.
Over the past 7 days the lake has been falling (−2.02 ft), and it is −3.50 ft over 30 days.
Compared with a year ago (285.43 ft, same time of day), the lake is 1.16 ft higher.
Readings come from the USGS gauge “Blue Marsh Lake near Bernville, PA”. Gauge elevations are not directly comparable between lakes because each uses its own datum.
Lake facts
| Gauge / station | Blue Marsh Lake near Bernville, PA |
|---|---|
| Elevation datum | ft above gauge datum |
| Gauge location | 40.3793, -76.0327 |
Nearby lakes
Common questions
Is Blue Marsh Lake rising or falling?
Over the last 7 days it changed −2.02 ft and over 30 days −3.50 ft.
How full is Blue Marsh Lake?
USGS publishes the water surface elevation for this gauge but not a percent-full figure, so we don't show one rather than estimate it.
How often is this page updated?
The page is rebuilt automatically every day from USGS's published data. Values can be revised later by the source agency.
Where does the data come from?
The U.S. Geological Survey's Water Data API (api.waterdata.usgs.gov), which publishes readings from USGS and partner gauges. Forecasts come from the National Weather Service.
Latest instantaneous reading; 7-day, 30-day and year-ago changes compare readings at the same hour. USGS data are provisional and subject to revision. This page is not affiliated with or endorsed by the USGS. See data sources.