St Marys River At Great Mills, Md Realtime Data
ST MARYS RIVER AT GREAT MILLS, MD
Realtime Data • Report • Conditions
12
Discharge (cfs)
1.6
Gauge Height (ft)
Streamflow discharge was last observed at 12 cfs, and a gauge height of 1.58 feet.
With the
% decrease since yesterday,
the streamflow average over the past 10 days is 22 .
Weather today, Tomorrow,
Marys River at Great Mills, MD streamgauge measures the water flow of the St. Marys River, which is primarily fed by groundwater sources and precipitation. The river runs through several tributaries, including the lower Patuxent River and the Potomac River. The flow of the river tends to be highest during the winter and spring months due to increased precipitation and snowmelt. The river is also influenced by the nearby Great Mills Dam, which was constructed in the early 1900s to provide flood control and power generation. Interestingly, the St. Marys River is known for its high quality water, which supports a variety of aquatic life, including blue crabs and striped bass.
July 13, 2026
| Elevation | 13.0 ft |
| Last Updated | |
| Gage height, ft | 1.58 ft |
| Streamflow, ft³/s | 12.1 ft3/s |
| Stream water level elevation above NAVD 1988, in ft | 8.01 ft |
| Percent of Normal | 130% |
| Year Over Year Average | 9 cfs |
| 24hr Flow Prediction | cfs |
| Maximum Recorded | 6,960 cfs |
| Geolocation | 38.24, -76.50 |
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