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 4.7 feet below full pool, with a water-surface elevation of 285.3 feet.

285.32 ft · Updated 4 hours ago · U.S. Geological Survey

Current level

285.32ft

−4.68 ft vs full pool

Low

Vs full pool

Since last reading

Up 0.03 ft

Previous readingNov 8285.29 ft

7-day change

Up 0.37 ft

7-day trend: Rising

8 daily readings in the last 7 days

30-day change

Down 4.86 ft

30 daily readings in the last 30 days

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Water Level History

Current
285.32 ft
24h
+0.03 ft
7d
+0.37 ft
30d
-4.86 ft

Elevation (ft) MSL

Reference line is designed full pool.

Water Temperature

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Lake Level Context

Level remains below the full pool

Blue Marsh Lake is currently 285.32 ft, 4.68 ft below its full pool. The lake has risen 0.37 ft over the past 7 days and fallen 4.86 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

4.68 ft below full pool

Current level
285.32 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

Surrounding county drought

Abnormally Dry

Dominant category Abnormally Dry (D0); not counted as official drought.

Severity

NoneExtreme
Trend
Worsening

Surrounding county drought

Berks County, PA

Abnormally Dry

Abnormally Dry. The largest share of Berks County, PA is Abnormally Dry (D0), which the U.S. Drought Monitor does not count as official drought. These figures describe the surrounding county from the lake location, not the lake itself.. Trend: Worsening compared with last week. Official drought (D1–D4) no

Severity

NoneExtreme

Weekly trend

Worsening

Compared with last week

Official drought (D1–D4)

No

Abnormally Dry (D0) is present in the surrounding county, but D0 is not counted as official drought (D1–D4).

U.S. Drought Monitor · map date Nov 3, 2026. Updated weekly. Official drought means U.S. Drought Monitor categories D1–D4 (Moderate through Exceptional). Abnormally Dry (D0) is not counted as official drought. droughtmonitor.unl.eduView drought map for Berks County, PA

Daily level summary

DateLevelChange
Nov 9, 2026285.32+0.03
Nov 8, 2026285.29+0.05
Nov 7, 2026285.24+0.06
Nov 6, 2026285.18+0.07
Nov 5, 2026285.11+0.08
Nov 4, 2026285.03+0.07
Nov 3, 2026284.96+0.01

Common questions about Blue Marsh Lake’s water level

  • The current water level at Blue Marsh Lake is 285.32 ft (updated 4 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 0.37 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 4.68 ft below full pool.

Lake level glossary

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

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