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Rock Creek at Joyce Road
River Monitoring Site
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 and the National Oceanic and Atmospheric Administration (NOAA).
In Marcy 2026, USGS shut down the monitoring siteoring site near Sherrill Road in Rock Creek Park, which had been recording data since 1929, and replaced it with the site at Joyce Road nearby. Flow in the creek is affected by two upstream reservoirs, Lake Needwood on Rock Creek since Sept. 1966 and Bernard Frank Lake on North Branch Rock Creek since February 1968. USGS has recorded data at this site since 2012.
Current stream conditions are shown in the graph below:
For realtime data on this site, select this link.
Nearby Potomac River Stream Monitors | |
Upstream | Downstream |
To view a map of Potomac River Monitors, select this link. | |
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Contact Information
U.S. Geological Survey
5522 Research Park Drive
Baltimore MD 21228
443-498-5500
Website