Final TMDLs Approved by EPA: Deep Creek Lake

Deep Creek Lake is an impoundment located near McHenry in Garrett County, Maryland.  Deep Creek Lake was created in 1925 when the Youghiogheny Hydroelectric Company constructed a dam across Deep Creek. Today, the lake is owned by the State of Maryland. The lake receives inflow from several tributaries, including Cherry Creek, Meadow Mountain Run, North Glade Run, Green Glade Run, Pawn Run, and Red Run.

Deep Creek Lake was identified on the State of Maryland’s draft 2002 list of Water Quality Limited Segments [303(d) list] as impaired by mercury contamination, based on data for mercury concentrations in fish tissue.  Concentrations in the water are well below the threshold for concern in regard to drinking water.  The Maryland water quality standards Surface Water Use Designation [Code of Maryland Regulations (COMAR] for Deep Creek Lake is Use III-P - Natural Trout Waters and Public Water Supply.  The Maryland Department of the Environment’s (MDE) current public fish consumption advisory to eat limited amounts of fish from Deep Creek Lake is not supportive of the recreational fishing use.  Therefore, the document, available below, establishes a Total Maximum Daily Load (TMDL) for mercury in Deep Creek Lake. 

TMDL of Mercury for Deep Creek Lake, Garrett County, Maryland

(Approved on February 18, 2004)

EPA's Decision Letter

EPA's Decision Letter

Main Report


Comment Response Document



Contact Information

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