TidalMapHawlings River near Sandy Spring, 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 01591700 sits on the Hawlings River and reads everything draining 27 square miles of the Patuxent basin. Its datum sits 303 feet above sea level NAVD88. Daily flow has been on record here since 1978, 48 years of it.
Where this gauge sits in the drainage
No gauged site sits above this one on the mainstem, so this is the first published reading on the river. Downstream the next reading comes from Patuxent River near Laurel, MD at 132 square miles, so what passes this gauge is about 20% of the water measured there. Water passing here goes on to Patuxent River near Bowie, MD.
Normal flows here
The Hawlings River runs a median of 19 cfs at this gauge across 48 years of record. April is the fullest month at a median 30 cfs, and September the leanest at 7.0 cfs. The highest daily mean on record is 1,840 cfs in 1996, and the lowest is 0.1 cfs in 2002.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 24 cfs | 126% |
| Feb | 28 cfs | 147% |
| Mar | 30 cfs | 158% |
| Apr | 30 cfs | 161% |
| May | 25 cfs | 132% |
| Jun | 17 cfs | 89% |
| Jul | 11 cfs | 58% |
| Aug | 8.9 cfs | 47% |
| Sep | 7.0 cfs | 37% |
| Oct | 8.8 cfs | 46% |
| Nov | 15 cfs | 79% |
| Dec | 20 cfs | 105% |
Medians from the USGS daily-statistics record, 1978 to 2026. A month at 100% is running at its own long-term median.
Flood stages and record crests
The Hawlings River reaches flood stage at this gauge at 6.5 feet. NWS starts watching it at 5 feet. The highest crest on record is 9.2 feet, in January 1996.
| Category | Gage height |
|---|---|
| Action | 5 ft |
| Minor flooding | 6.5 ft |
| When | Crest |
|---|---|
| January 1996 | 9.2 ft |
| September 1979 | 8.8 ft |
| June 2001 | 8.8 ft |
| June 1998 | 8.6 ft |
| May 1989 | 8.3 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge SANM2. Stages are gage height, not depth. Not for navigation.
Nearby river gauges
- Patuxent River below Brighton Dam near Brighton MD
- Patuxent River near Unity, MD
- Cattail Creek near Glenwood, MD
- Paint Branch Tributary near Colesville, MD
- Northwest Branch Anacostia River near Colesville, MD
- Turkey Branch near Rockville, MD
- Paint Branch near College Park, MD
- Patuxent River near Laurel, MD
- Little Patuxent River at Guilford, MD
- Sligo Creek near Takoma Park, MD
- Little Patuxent River at Savage, MD
- Little Seneca Creek Tributary at Brink, MD
Live streamflow and gage height: USGS gauge 01591700. Percentile context computed against the gauge's period of record. Not for navigation.
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