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North Fork Catoctin Creek at Rt 681 near Waterford, VA Water Level Today

Virginia · USGS gauge 01638420 · live data · Updated Oct 28, 2026

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About this gauge

USGS gauge 01638420 sits on the North Fork Catoctin Creek and reads everything draining 23 square miles of the Middle Potomac-Catoctin basin. Its datum sits 326 feet above sea level NAVD88. Daily flow has been on record here since 2001, 25 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 Catoctin Creek at Taylorstown, VA at 90 square miles, so what passes this gauge is about 26% of the water measured there. Water passing here goes on to Potomac River at Point of Rocks, MD and Potomac River at Edwards Ferry near Poolesville,md.

Normal flows here

The North Fork Catoctin Creek runs a median of 13 cfs at this gauge across 25 years of record. March is the fullest month at a median 25 cfs, and September the leanest at 2.2 cfs. The highest daily mean on record is 1,190 cfs in 2008, and the lowest is 0.0 cfs in 2002.

Median flow by month
MonthMedian flowShare of annual median
Jan19 cfs146%
Feb23 cfs177%
Mar25 cfs192%
Apr22 cfs173%
May21 cfs162%
Jun13 cfs100%
Jul6.4 cfs49%
Aug3.0 cfs23%
Sep2.2 cfs17%
Oct4.5 cfs35%
Nov7.1 cfs55%
Dec14 cfs108%

Medians from the USGS daily-statistics record, 2001 to 2026. A month at 100% is running at its own long-term median.

Flood stages and record crests

The North Fork Catoctin Creek reaches flood stage at this gauge at 10 feet. NWS starts watching it at 8 feet. The highest crest on record is 11 feet, in September 2004.

NWS flood categories
CategoryGage height
Action8 ft
Minor flooding10 ft
Moderate flooding14 ft
Major flooding16 ft
Highest crests on record
WhenCrest
September 200411 ft
September 200310.9 ft
May 201410.1 ft
October 201210.1 ft
May 20089.5 ft

Flood categories and crest history from the NOAA National Water Prediction Service, gauge WNFV2. Stages are gage height, not depth. Not for navigation.

Nearby river gauges

Live streamflow and gage height: USGS gauge 01638420. Percentile context computed against the gauge's period of record. Not for navigation.

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