Water Quality Analyses (WQA) with EPA Concurrence of MDE's Findings: Lake Needwood

Lake Needwood is an impoundment located near Rockville in Montgomery County, Maryland. The impoundment, which is owned by the Maryland - National Capital Park and Planning Commission, lies on Rock Creek, a tributary of the Potomac River. An earthen dam was installed in 1965 for the purpose of sediment and flood control and creating a lake for recreational uses. The lake was periodically dredged, ending in 1990.

Lake Needwood in the Rock Creek watershed (02140206) was identified on Maryland’s 1998 list of water quality limited segments (WQLSs) as being impaired by nutrients. The report available below analyzes recent monitoring data, showing that the dissolved oxygen criterion and designated uses associated with nutrients are being met in Lake Needwood. The analysis supports the conclusion that a TMDL for nutrients is not necessary to achieve water quality standards in this case. Barring the receipt of any contradictory data, this report will be used to support the removal of Lake Needwood from Maryland’s list of WQLSs for nutrients when the Maryland Department of the Environment (MDE) proposes the revision of Maryland’s 303(d) list for public review in the future. 

WQA of Eutrophication for  Lake Needwood, 
Montgomery County, MD

(Concurrence: January 22, 2003)

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.