Final TMDLs Approved by EPA: Cabin John Creek

The Cabin John Creek watershed is located in southern Montgomery County, Maryland, just northwest of Washington, DC.  The headwaters of Cabin John Creek originate in the City of Rockville.  The creek flows south about 10 miles, passing under Interstate 270, through Cabin John Regional Park under the Capital Beltway (I-495) and the historic Cabin John Bridge to its confluence with the Potomac River near the towns of Cabin John and Glen Echo. The major tributaries of the Creek are Bogley Branch, Booze Creek, Buck Branch, Congressional Branch, Ken Branch, Old Farm Branch, Snakeden Branch and Thomas Branch (also called Beltway Branch).  Cabin John Creek and all its tributaries are non-tidal.

The Maryland Department of the Environment (MDE) has identified the non-tidal waters of Cabin John Creek, a Use I-P waterbody [Code of Maryland Regulations (COMAR)] in the State’s 303(d) List as impaired by nutrients (1996), sediments (1996), fecal bacteria (2002) and impacts to biological communities (2002).  The document available below establishes a TMDL of fecal bacteria in the non-tidal portions of Cabin John Creek to allow for the attainment of beneficial use designation, primary contact recreation.  The listings for nutrients, suspended sediments and impacts to biological communities will be addressed separately at a future date.

The U.S. Environmental Protection Agency (EPA) initially approved the TMDL on September 11, 2006.  However, during the review and approval process a number of edits occurred and a few were completed incorrectly.  As a result, the Department resubmitted the corrected document for approval. 

Total Maximum Daily Loads of Fecal Bacteria for the Non-tidal Cabin John Creek Basin in Montgomery County, Maryland

(Approved on March 14, 2007)

EPA's Decision Letter EPA's Decision Letter
Main Report TMDL_cabinjohn_fc.pdf (2518KB)

Comment Response Document

CRD_cabinjohn_fc.pdf (117KB)


Contact Information

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