TidalMapWest Branch Herring Run at Idlewylde, 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 01585200 sits on West Branch Herring Run and reads everything draining 2.1 square miles of the Gunpowder-Patapsco basin. Its datum sits 278 feet above sea level NAVD88. Daily flow has been on record here since 1957, 58 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 Herring Run at Sinclair Lane at Baltimore, MD at 16 square miles, so what passes this gauge is about 13% of the water measured there.
Normal flows here
West Branch Herring Run runs a median of 1.1 cfs at this gauge across 58 years of record. March is the fullest month at a median 1.8 cfs, and September the leanest at 0.6 cfs. The highest daily mean on record is 179 cfs in 2014, and the lowest is 0.0 cfs in 1957.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 1.3 cfs | 118% |
| Feb | 1.6 cfs | 145% |
| Mar | 1.8 cfs | 164% |
| Apr | 1.7 cfs | 155% |
| May | 1.4 cfs | 127% |
| Jun | 1.1 cfs | 100% |
| Jul | 0.8 cfs | 74% |
| Aug | 0.8 cfs | 69% |
| Sep | 0.6 cfs | 58% |
| Oct | 0.7 cfs | 61% |
| Nov | 0.8 cfs | 73% |
| Dec | 1.2 cfs | 109% |
Medians from the USGS daily-statistics record, 1957 to 2025. A month at 100% is running at its own long-term median.
Flood stages and record crests
West Branch Herring Run reaches flood stage at this gauge at 9 feet. NWS starts watching it at 6 feet. The highest crest on record is 10.9 feet, in August 2012.
| Category | Gage height |
|---|---|
| Action | 6 ft |
| Minor flooding | 9 ft |
| Moderate flooding | 12.5 ft |
| Major flooding | 14 ft |
| When | Crest |
|---|---|
| August 2012 | 10.9 ft |
| August 2018 | 9.4 ft |
| June 2016 | 9 ft |
| February 2016 | 7.7 ft |
| July 2019 | 7.5 ft |
Flood categories and crest history from the NOAA National Water Prediction Service, gauge IDLM2. Stages are gage height, not depth. Not for navigation.
Nearby river gauges
- Minebank Run near Glen Arm, MD
- Long Quarter Branch at Lutherville, MD
- Herring Run at Sinclair Lane at Baltimore, MD
- Moores Run at Radecke Ave at Baltimore, MD
- Whitemarsh Run near Fullerton, MD
- Beaverdam Run at Cockeysville, MD
- Long Green Creek at Glen Arm, MD
- Whitemarsh Run at White Marsh, MD
- Baisman Run at Broadmoor, MD
- Dead Run at Franklintown, MD
- Pond Branch at Oregon Ridge, MD
- Honeygo Run near White Marsh, MD
Live streamflow and gage height: USGS gauge 01585200. Percentile context computed against the gauge's period of record. Not for navigation.
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