TidalMapLong Branch near Annandale, VA 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 01654500 sits on Long Branch and reads everything draining 3.7 square miles of the Middle Potomac-Anacostia-Occoquan basin. Its datum sits 203 feet above sea level NAVD88. Daily flow has been on record here since 1948, 22 years of it.
Where this gauge sits in the drainage
One gauged site sits upstream of here. The closest is Long Branch at Olley Lane near Fairfax, VA, reading 1.2 square miles. This gauge adds the 2.5 square miles that drain in between. Downstream the next reading comes from Accotink Creek below Lake Accotink, VA at 31 square miles, so what passes this gauge is about 12% of the water measured there. Water passing here goes on to Accotink Creek at Keene Mill Rd at Springfield, VA.
Normal flows here
Long Branch runs a median of 2.2 cfs at this gauge across 22 years of record. May is the fullest month at a median 3.4 cfs, and September the leanest at 1.0 cfs. The highest daily mean on record is 402 cfs in 2018, and the lowest is 0.0 cfs in 1955.
| Month | Median flow | Share of annual median |
|---|---|---|
| Jan | 2.4 cfs | 109% |
| Feb | 3.2 cfs | 145% |
| Mar | 3.2 cfs | 145% |
| Apr | 3.1 cfs | 141% |
| May | 3.4 cfs | 155% |
| Jun | 2.2 cfs | 100% |
| Jul | 1.5 cfs | 68% |
| Aug | 1.2 cfs | 55% |
| Sep | 1.0 cfs | 45% |
| Oct | 1.0 cfs | 45% |
| Nov | 1.6 cfs | 73% |
| Dec | 2.3 cfs | 105% |
Medians from the USGS daily-statistics record, 1948 to 2026. A month at 100% is running at its own long-term median.
Nearby river gauges
- Accotink Creek near Annandale, VA
- Long Branch at Olley Lane near Fairfax, VA
- Accotink Creek at Keene Mill Rd at Springfield, VA
- Tripps Run at Falls Church, VA
- Four Mile Run at Hwy 29 at Falls Church, VA
- Difficult Run above Fox Lake near Fairfax, VA
- Cameron Run at Alexandria, VA
- South Fork Little Difficult Run above Mouth near Vienna, VA
- Fourmile Run at Alexandria, VA
- Snakeden Branch above Lake Audubon at Reston, VA
- Dead Run at Whann Avenue near Mclean, VA
- Difficult Run near Great Falls, VA
Live streamflow and gage height: USGS gauge 01654500. Percentile context computed against the gauge's period of record. Not for navigation.
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