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Casselman River at Grantsville

Highest listed crest 10.70 ftFlood stage 4.5 ft6 crests since 1948

The Casselman River at Grantsville crested above flood stage 6 times among the 6 crests the National Weather Service lists from 1948 to 2021. The highest, 10.70 ft on October 15, 1954, was moderate flooding, 6.20 feet above flood stage.

The gauge

Highest listed crest
10.70 ft
October 15, 1954; 8,400 cubic feet per second
Flood stage
4.5 ft
No major stage set
Crests at major
0
6 above flood stage
Most recent flood crest
September 1, 2021
7.29 ft, moderate flooding
Location
Garrett County
Maryland

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Casselman River at Grantsville
Action stage3.50—The level at which the NWS or its partners begin to take action
Flood stage (minor)4.50—Minimal or no property damage, but possibly some public threat
Moderate flood stage6.06Sep 1, 2021Some inundation of structures and roads near the stream

Every listed crest

6 crests from 1948 to 2021. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Casselman River at Grantsville, 1948 to 2021 4681012ft Flood stage 4.5 ft Jul 4, 1948: 8.13 ft, moderate flooding; 5,110 cubic feet per secondOct 15, 1954: 10.70 ft, moderate flooding; 8,400 cubic feet per secondNov 5, 1985: 7.04 ft, moderate flooding; 4,030 cubic feet per secondJan 19, 1996: 9.15 ft, moderate flooding; 6,410 cubic feet per secondSep 9, 2018: 7.10 ft, moderate flooding; 4,530 cubic feet per secondSep 1, 2021: 7.29 ft, moderate flooding; 4,750 cubic feet per second Highest, 10.70 ft, Oct 15, 1954 19501960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Casselman River at Grantsville 1940s: 1 1 1950s: 1 1960s: 0 1970s: 0 1980s: 1 1990s: 1 2000s: 0 2010s: 1 2020s: 1 1940s1950s1960s1970s1980s1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Casselman River at Grantsville
1Oct 15, 195410.70+6.20Moderate8,400
2Jan 19, 19969.15+4.65Moderate6,410
3Jul 4, 19488.13+3.63Moderate5,110
4Sep 1, 20217.29+2.79Moderate4,750
5Sep 9, 20187.10+2.60Moderate4,530
6Nov 5, 19857.04+2.54Moderate4,030

The worst floods along the Casselman River

For this gauge's highest crests, the other gauges on the Casselman River that crested above flood stage within a week.

January 19, 1996: 9.15 ft here, moderate flooding

  • MarkletonPA · Jan 19, 1996 · 13.26 ft · Minor

Gauges on the Casselman River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Casselman River
Grantsville this gaugeMD4.510.70 ft, Oct 15, 19540
MarkletonPA9.016.40 ft, Mar 17, 19360

Other gauges in Garrett County

Flood gauges in Garrett County
Kitzmiller9.014.85 ft, Nov 5, 19850
Steyer9.013.14 ft, Nov 5, 19853

Garrett County: every hazard · River floods across the country · Maryland

NOAA National Water Prediction Service, gauge GNTM2, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.