Total Maximum Daily Loads of Fecal Bacteria for the Loch Raven Reservoir Basin in Baltimore, Carroll, and Harford Counties, Maryland

Final TMDLs Approved by EPA: Loch Raven Reservoir

The Loch Raven Reservoir watershed is located in both Maryland (MD) and Pennsylvania (PA), with a drainage area of 224.4 square miles (143,617 acres). The majority of the watershed is in MD with a portion in York County, PA. The MD portion is largely in Baltimore County, with small areas in Carroll and Harford counties. The watershed includes the towns of Lutherville, Timonium, Cockeysville, Phoenix, Parkton, and Hampstead. The tributaries to the reservoir include Gunpowder Falls, Greene Branch, Beaverdam Run, Royston Branch, Overshot Run, Merryman Branch, Fitzhugh Run, Jenkins Run, Dulaney Branch, Kelly Branch, Spring Branch, Long Quarter Branch and Rush Brook. Gunpowder Falls begins at the outlet of the Prettyboy Reservoir. A major tributary to Gunpowder Falls is Little Falls, which begins near the PA border.The Loch Raven Reservoir watershed is located in both Maryland (MD) and Pennsylvania (PA), with a drainage area of 224.4 square miles (143,617 acres). The majority of the watershed is in MD with a portion in York County, PA. The MD portion is largely in Baltimore County, with small areas in Carroll and Harford counties. The watershed includes the towns of Lutherville, Timonium, Cockeysville, Phoenix, Parkton, and Hampstead. The tributaries to the reservoir include Gunpowder Falls, Greene Branch, Beaverdam Run, Royston Branch, Overshot Run, Merryman Branch, Fitzhugh Run, Jenkins Run, Dulaney Branch, Kelly Branch, Spring Branch, Long Quarter Branch and Rush Brook. Gunpowder Falls begins at the outlet of the Prettyboy Reservoir. A major tributary to Gunpowder Falls is Little Falls, which begins near the PA border.

The Maryland Department of the Environment (MDE) has identified the tributaries of Loch Raven Reservoir on the State’s 303(d) List [Category 5 of the Integrated Report of Surface Water Quality in Maryland (Integrated Report)] as impaired by fecal bacteria (listed in 2008) and impacts to biological communities (listed in 2002, 2004 and 2008). The reservoir itself is not listed as impaired by fecal bacteria. The Loch Raven Reservoir and all its tributaries have been designated as Use III-P (Nontidal Cold Water and Public Water Supply). See Code of Maryland Regulations (COMAR) 26.08.02.08J. The document, available below, establishes a TMDL for fecal bacteria in the Loch Raven Reservoir watershed that will allow for attainment of the beneficial use designation of water contact recreation. The listings for impacts to biological communities will be addressed in a separate TMDL document. Listings for the impoundment have already been addressed by TMDLs for phosphorus, sediments and mercury, and a WQA for heavy metals. MDE monitored the Loch Raven Reservoir watershed from 2003-2004 for fecal bacteria. A data solicitation for fecal bacteria was conducted by MDE in 2003, and all readily available data from the past five years were considered. To account for portions of subwatersheds located in Pennsylvania (PA), an upstream load allocation (LAPA), determined to be necessary in order to meet MD water quality standards in the MD portion of the watershed, is also included in this TMDL.

Total Maximum Daily Loads of Fecal Bacteria for Loch Raven Reservoir in Baltimore, Carroll and Harford Counties, Maryland

(Approved on December 3, 2009)

EPA's Decision Letter

EPA's Decision Letter

Main Report

Loch_Raven_Reservoir_Bacteria_TMDL_Final.pdf (1855KB)

Comment Response Document

Loch_Raven_Reservoir_Bacteria_CRD_Final.pdf (35KB)

 
Contact Information
Please direct questions or comments concerning this project to Maryland's TMDL Program at (410) 537-3572.