The Cabin John Creek watershed is located in southern Montgomery County, Maryland, just northwest of Washington, DC. The Cabin John Creek watershed encompasses 16,500 acres. 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 watershed is bounded by Rockville Pike (Rte. 355) and Old Georgetown Pike (Rte. 187) to the east and Falls Road (Rte. 189) to the west. 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).
The waters of Cabin John Creek (MD basin code 02140207), located in Montgomery County, have been identified on the Integrated Report under Category 5 as impaired by nutrients (1996), sediments (1996), and impacts to biological communities (2002). All impairments are listed for non-tidal streams. The 1996 suspended sediment listing was refined in the 2008 Integrated Report to a listing for total suspended solids. Similarly, the 1996 nutrients listing were refined in the 2008 Integrated Report and phosphorus was identified as the specific impairing substance. Consequently, for the purpose of the report available below, the terms “nutrients” and “phosphorus” will be used interchangeably. The listings for sediments and impacts to biological communities will be addressed separately at a future date.
Water Quality Analysis of Eutrophication for the Cabin John Creek Basin in Montgomery County, Maryland
(Concurrence September 24, 2009)
Comment Response Document
Biological Stressor Identification Methodology Report
1800 Washington Boulevard, Baltimore, MD 21230