Blue Marsh Lake lake and shoreline

Blue Marsh Lake Water Level

Officially Blue Marsh Lake (Tulpehocken Creek)

Pennsylvania

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Blue Marsh Lake

Blue Marsh Lake is currently at full pool, with a water-surface elevation of 290.1 feet.

290.09 ft · Updated 5 hours ago · U.S. Geological Survey

Current level

290.09ft

At full pool

Normal

Vs full pool

Since last reading

Down 0.07 ft

Previous readingSep 23290.16 ft

7-day change

Up 0.03 ft

7-day trend: Rising

8 daily readings in the last 7 days

30-day change

Up 0.02 ft

31 daily readings in the last 30 days

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Water Level History

Current
290.09 ft
24h
-0.07 ft
7d
+0.03 ft
30d
+0.02 ft

Elevation (ft) MSL

Reference line is designed full pool.

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Lake Level Context

Level is near the full pool

Blue Marsh Lake is currently 290.09 ft, near its full pool. The lake has risen 0.03 ft over the past 7 days and 0.02 ft over the past 30 days.

Blue Marsh Lake Level Details

Reference elevations, recent daily readings, data sources, and answers to common questions.

Conditions & Reference

Level status

0.09 ft above full pool

Current level
290.09 ft
Full pool
290 ft
DatumVertical reference for published pool and stage elevations at this lake (from the lake catalog).
Not available
Elevation reference
MSL
Source
USGS

Reference levels

  • Full pool290 ft

Watershed drought

Abnormally Dry

Abnormally dry (D0), not official drought.

Severity

NoneExtreme
Trend
Improving

Watershed drought conditions

Berks County, PA

Abnormally Dry

Abnormally Dry. The surrounding county is abnormally dry, which is not official drought.. Trend: Improving compared with last week. Official drought no

Severity

NoneExtreme

Weekly trend

Improving

Compared with last week

Official drought

No

Current conditions are classified as Abnormally Dry (D0), which is not considered official drought.

U.S. Drought Monitor · map date Sep 22, 2026. Updated weekly. droughtmonitor.unl.eduView drought map for Berks County, PA

Daily level summary

DateLevelChange
Sep 24, 2026290.09-0.07
Sep 23, 2026290.16-0.16
Sep 22, 2026290.32-0.03
Sep 21, 2026290.35-0.01
Sep 20, 2026290.36+0.22
Sep 19, 2026290.14+0.06
Sep 18, 2026290.08+0.02

Common questions about Blue Marsh Lake’s water level

  • The current water level at Blue Marsh Lake is 290.09 ft (updated 5 hours ago). You can track the Blue Marsh Lake lake level on the interactive chart and daily history above.

  • Full pool for Blue Marsh Lake is 290 ft — the normal conservation target elevation when the reservoir is at its designed summer or operating pool.

  • The current 7-day trend for the Blue Marsh Lake lake level is rising — rising about 0.03 ft over the past week. See the history chart above for the full picture.

  • Based on the latest gauge reading, Blue Marsh Lake is currently at full pool.

Lake level glossary

Definitions for pool targets, datums, and how elevation readings are labeled.

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