Final TMDLs Approved by EPA: Clopper Lake

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. 

TMDLs of Phosphorus and Sediments
to Clopper Lake, Montgomery County, MD

(Approved on April 4, 2002)

EPA's Decision Letter

EPA's Decision Letter

Main Report

clopper_main_final.pdf (1796 KB)

Nonpoint Source Technical Memorandum

clopper_techmemo_final.pdf (118 KB)

Comment Response Document

clopper_crd_final.pdf (124KB)


Contact Information

Please direct questions or comments concerning this project to Maryland's TMDL Program at (410) 537-3818.