Clopper Lake is an impoundment located within Seneca Creek State Park, near Gaithersburg in Montgomery County, Maryland. The impoundment lies on Long Draught Branch, a tributary of the Seneca Creek. The Seneca Creek lies in the Potomac River Drainage Basin. Clopper Lake was constructed for flood control and recreation.
On the basis of water quality problems associated with nutrients and sediments, Clopper Lake in the Seneca Creek watershed (02140208) was identified on Maryland’s 1998 list of water quality limited segments (WQLSs) as being impaired. The document available below establishes Total Maximum Daily Loads (TMDLs) for the nutrient phosphorus and sediments entering Clopper Lake.
EPA's Decision Letter
clopper_main_final.pdf (1796 KB)
Nonpoint Source Technical Memorandum
clopper_techmemo_final.pdf (118 KB)
Comment Response Document
Please direct questions or comments concerning this project to Maryland's TMDL Program at (410) 537-3818.
1800 Washington Boulevard, Baltimore, MD 21230