On Wednesday, July 14, 2021, at site FW36, Manassas Run upstream of the confluence with main-stem Shenandoah River, just upstream of the public boat landing, the E. coli level was 435.2 MPN of E. coli colony-forming units per 100 mL. This level exceeded the previous Virginia water-quality standard threshold of 235 E. coli colony forming units per 100 mL of water sample for primary recreational use.
The amount of flow in the North Fork, South Fork, and Main-stem of the Shenandoah River has been steadily decreasing. The recent localized rain events have not been enough to recharge the water supply.
FOSR 2021 Summer Quantitative E. coli Concentration Results through 07.14.2021
