South Fork Little Difficult Run above Mouth near Vienna, VA Water Level Today

NWS river forecast

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 01645762 sits on the South Fork Little Difficult Run and reads everything draining 2.7 square miles of the Middle Potomac-Catoctin basin. Its datum sits 275 feet above sea level NAVD88. Daily flow has been on record here since 2007, 19 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 Difficult Run near Great Falls, VA at 58 square miles, so what passes this gauge is about 5% of the water measured there. Water passing here goes on to Potomac River near Wash, Dc Little Falls Pump Sta.

Normal flows here

The South Fork Little Difficult Run runs a median of 1.6 cfs at this gauge across 19 years of record. March is the fullest month at a median 2.6 cfs, and September the leanest at 0.5 cfs. The highest daily mean on record is 283 cfs in 2011, and the lowest is 0.0 cfs in 2007.

Medians from the USGS daily-statistics record, 2007 to 2026. A month at 100% is running at its own long-term median.