The Monocacy River is a free flowing stream that originates in Pennsylvania and flows 58 miles within Maryland where it finally empties into the Potomac River. It covers approximately 966 square miles, with approximately 224 square miles located in Pennsylvania and 742 square miles in Maryland. The basin can be subdivided into three distinct watersheds: the Upper Monocacy River, Lower Monocacy River, and Double Pipe Creek. The Double Pipe Creek watershed is located within Frederick and Carroll Counties, Maryland. The stream system empties into the Maryland 8-Digit (MD 8-Digit) Upper Monocacy River watershed.
The Maryland Department of the Environment (MDE) has identified the waters of Double Pipe Creek on the State’s 303(d) List as impaired by sediments (1996), nutrients (1996), bacteria (2002), and impacts to biological communities (2002). The designated use of Double Pipe Creek and its tributaries is Use IV-P (Recreational Trout Waters and Public Water Supply).
The document available below establishes a Total Maximum Daily Load (TMDL) for sediment in the Double Pipe Creek watershed (basin number 02140304) (303(d) Assessment Unit ID: MD-02140304).
A TMDL for fecal coliform to address the 2002 bacteria listing was submitted to the EPA in 2007. The listings for nutrients and impacts to biological communities will be addressed separately at a future date.
(Approved on February 20, 2009)
EPA's Decision Letter
Additional Supporting Information
Using MBSS Data to Identify Stressors for Streams that Fail Biocriteria in Maryland (4775 KB)
A Methodology for Addressing Sediment Impairments in Maryland's Non-tidal Watersheds (361 KB)
Please direct questions or comments concerning this project to Maryland's TMDL Program at (410) 537-3818.
1800 Washington Boulevard, Baltimore, MD 21230