Final TMDLs Approved by EPA: Gwynns Falls

The Gwynns Falls watershed is located in the Patapsco River Basin within Maryland.  The watershed encompasses 41,710 acres (61 square miles) in Baltimore City and Baltimore County, Maryland.  The headwaters of the Gwynns Falls begin in Glyndon, Maryland and flows southeast until its confluence with the Middle Branch of the Patapsco River near downtown Baltimore.  Five major tributaries of the Gwynns Falls, listed north to south, include:  Red Run, Horsehead Branch, Scotts Level Branch, Dead Run, and Maidens Choice Creek.

The Maryland Department of the Environment (MDE) has identified Gwynns Falls in the State of Maryland’s 303(d) List as impaired by nutrients (1996), sediments (1996), bacteria (fecal coliform) (2002), and impacts to biological communities (2002).  The designated uses for Gwynns Falls are as follows:  Gwynns Falls and tributaries above Reisterstown Road – Use III (Nontidal Cold Water); Dead Run and tributaries – Use IV (Recreational Trout Waters); and all remaining waters – Use I (Water Contact Recreation, and Protection of Nontidal Warmwater Aquatic Life).  See Code of Maryland Regulations (COMAR) & (5)(e).  The document, available below, establishes a TMDL for fecal bacteria in Gwynns Falls and its tributaries that will allow for the attainment of the designated use of primary contact recreation.  The listings for sediments, nutrients, and impacts to biological communities will be addressed separately at a future date.  

Total Maximum Daily Loads of Fecal Bacteria for the Non-Tidal Gwynns Falls Basin in Baltimore City and Baltimore County, Maryland

(Approved on December 4, 2007)

EPA's Decision Letter EPA's Decision Letter
Main Report TMDL_gwynnsfalls_fc.pdf (1449KB)

Comment Response Document

CRD_gwynnsfalls_fc.pdf (104KB)


Contact Information

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