Interactive Maps

The Lower Potomac

The Potomac Estuary

Mount Vernon to Anacostia River

Mall Area

Georgetown to Great Falls

Potomac Piedmont

Upper Potomac

The North Branch

Boat Ramps

Monitoring Sites

Bridges and Ferries

Cruises and Charters

Search Potomac Sites

Also Explore

Catoctin Creek VA Gage

USGS Streamflow Monitor

The U.S. Geological Survey stream monitoring site on Catoctin Creek in Loudoun County, Virginia has been collecting hydrologic data since March 1969. Located near Route 9 and Hillsboro, this site monitors the North Fork of Catoctin Creek, which flows eastward from the Blue Ridge Mountains toward Waterford. The station was established to support regional water resource planning and environmental monitoring in the rapidly developing Loudoun Valley. Over the decades, it has contributed valuable data on streamflow patterns, seasonal variations, and watershed health. The site plays a key role in understanding the hydrologic dynamics of the Middle Potomac-Catoctin subbasin and supports flood risk assessment, land use planning, and ecological conservation efforts throughout the region.

Federal and state agencies maintain river level monitors throughout the Potomac River Basin. The U.S.Geological Survey compiles real-time information from river monitors, in cooperation with the U.S. Army Corps of Engineers.

Current stream conditions are shown in the graph below:

For real-time data on this site, select this link.

Suggested Links

Contact Information
U.S. Geological Survey
5522 Research Park Drive
Richmond VA 23228

Website