TidalMapCasselman River at Grantsville, MD Water Level Today
NWS river forecast
| When | Stage | Flow |
|---|
Forecast from the NOAA National Water Prediction Service. Issued a few times a day and only while a forecast is active. Not for navigation.
Last 30 days
About this gauge
USGS gauge 03078000 sits on the Casselman River and reads everything draining 64 square miles of the Youghiogheny basin. Its datum sits 2,089 feet above sea level NAVD88. Daily flow has been on record here since 1947, 79 years of it.
Normal flows here
The Casselman River runs a median of 76 cfs at this gauge across 79 years of record. March is the fullest month at a median 176 cfs, and September the leanest at 11 cfs. The highest daily mean on record is 3,600 cfs in 1996, and the lowest is 0.0 cfs in 1962.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 110 cfs | 145% |
| Feb | 125 cfs | 164% |
| Mar | 176 cfs | 232% |
| Apr | 143 cfs | 188% |
| May | 109 cfs | 143% |
| Jun | 46 cfs | 61% |
| Jul | 22 cfs | 29% |
| Aug | 15 cfs | 20% |
| Sep | 11 cfs | 14% |
| Oct | 15 cfs | 20% |
| Nov | 52 cfs | 69% |
| Dec | 105 cfs | 138% |
Medians from the USGS daily-statistics record, 1947 to 2026. A month at 100% is running at its own long-term median.
Flood stages and record crests
The Casselman River reaches flood stage at this gauge at 4.5 feet. NWS starts watching it at 3.5 feet. The highest crest on record is 10.7 feet, in October 1954.
| Category | Gage height |
|---|---|
| Action | 3.5 ft |
| Minor flooding | 4.5 ft |
| Moderate flooding | 6 ft |
| When | Crest |
|---|---|
| October 1954 | 10.7 ft |
| January 1996 | 9.2 ft |
| July 1948 | 8.1 ft |
| September 2021 | 7.3 ft |
| September 2018 | 7.1 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge GNTM2. Stages are gage height, not depth. Not for navigation.
Nearby river gauges
- Savage River near Barton, MD
- Georges Creek at Franklin, MD
- North Glade Run near Swanton, MD
- North Branch Potomac River at Luke, MD
- Cherry Creek at State Park Road near Mchenry, MD
- Bear Creek at Friendsville, MD
- Arrowhead Run at Thayerville, MD
- Youghiogheny River at Friendsville, MD
- North Branch Potomac River at Kitzmiller, MD
- Youghiogheny River near Mchenry, MD
- Youghiogheny River near Swallow Falls Park, MD
- Wills Creek near Cumberland, MD
Live streamflow and gage height: USGS gauge 03078000. Percentile context computed against the gauge's period of record. Not for navigation.
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