Summary
Total streamflow across the
Casselman River
was last observed at
174
cfs, and is expected to yield approximately
345
acre-ft of water today; about 22%
of normal.
River levels are low and may signify a drought.
Average streamflow for this time of year is
791 cfs,
with recent peaks last observed
on
2025-05-14 when daily discharge volume was observed at
29,280 cfs.
Maximum discharge along the river is currently at the
Casselman River At Markleton
reporting a streamflow rate of 89.5 cfs.
This is also the highest stage along the Casselman River, with a gauge stage of
2.24 ft at this location.
This river is monitored from 2 different streamgauging stations along the Casselman River, the highest being situated at an altitude of 2,135 ft, the
Casselman River At Grantsville.
River Details
| Last Updated | 2025-12-15 |
| Discharge Volume | 345 ACRE-FT |
| Streamflow |
173.9 cfs
-70.1 cfs (-28.73%) |
| Percent of Normal | 21.97% |
| Maximum |
29,280.0 cfs
2025-05-14 |
| Seasonal Avg | 791 cfs |
River Streamflow Levels
| Streamgauge | Streamflow | Gauge Stage | 24hr Change (%) | % Normal | Minimum (cfs) | Maximum (cfs) | Air Temp | Elevation |
|---|---|---|---|---|---|---|---|---|
|
Casselman River At Grantsville
USGS 03078000 |
84 cfs | 1.56 ft | -23.27 | |||||
|
Casselman River At Markleton
USGS 03079000 |
90 cfs | 2.24 ft | -33.21 |
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile
The Casselman River is a 56.5-mile-long (90.9 km) tributary of the Youghiogheny River in western Maryland and Pennsylvania in the United States.The Casselman River rises in Garrett County atop the plateau of western Maryland as two branches, the south one east of Meadow Mountain, the north one farther west, between Meadow Mountain and Negro Mountain. The two branches flow northward combining just southwest of Grantsville, Maryland. The river then continues north into Pennsylvania, following a great arc across the Laurel Highlands of Somerset County, Pennsylvania to the community of Confluence, where Laurel Hill Creek joins a few meters above the Youghiogheny River.The river has been used for transportation across the Allegheny Mountains, between the cities of Baltimore and Washington, D.C. in the east and Pittsburgh in the west. Two railroads followed the Casselman River from Meyersdale, Pennsylvania to Confluence. First is the B&O Railroad, running between Baltimore and Pittsburgh, which was completed in 1827, and is currently owned by CSX. Second is the Western Maryland Railway, which ran from Cumberland, Maryland to Connellsville, Pennsylvania. Although the Western Maryland was abandoned in the 1980s, the right-of-way has been converted into the Great Allegheny Passage, a rail trail bicycle and hiking path.