Final TMDLs Approved by EPA: Double Pipe Creek

The Double Pipe Creek watershed is located in Frederick and Carroll Counties in Maryland (MD). The total drainage area of Double Pipe Creek is approximately 192.6 square miles (123,232 acres), and lies north, west, and southwest of the Westminster metropolitian area. Double Pipe Creek and its tributaries flow through several small towns that include Manchester, Union Bridge, Taneytown, New Windsor, and Westminster. The headwaters of Double Pipe Creek originate in Westminster and Manchester, flowing west toward the city of Rocky Ridge, entering the Monocacy River and eventually emptying into the Middle Potomac River near the town of Dickerson.

There are two major drainage areas comprising the Double Pipe Creek watershed: Big Pipe Creek and Little Pipe Creek. These branches are free-flowing (non-tidal) streams, and flow into Double Pipe Creek at Detour and Keymar, MD before discharging into the Monocacy River at Rocky Ridge.

Double Pipe Creek and its tributaries, Little Pipe Creek, Big Pipe Creek, Sam's Creek, Meadow Branch and Bear Branch, have been identified in the State of Maryland's 303(d) List as impaired by the following (years listed in parentheses): nutrients (1996), sediments (1996) and impacts to biological communities (2002). It was also listed for fecal bacteria in 2002 as category 3(a) (waters that have insufficient data and information to determine waterbody attainment status). In 2003 and 2004, MDE monitored Double Pipe Creek for fecal bacteria and the monitoring data analysis confirmed a fecal bacteria impairment in the watershed. Therefore, this report documents a TMDL of fecal bacteria for the watershed. Double Pipe Creek and its tributaries Big Pipe Creek, Little Pipe Creek, Meadow Branch and Sam's Creek have been designated as Use IV-P waterbodies (Recreational Trout Waters and Public Water Supply). Bear Branch is designated as a Use III-P waterbody (Nontidal Cold Water and Public Water Supply). See Code of Maryland Regulations (COMAR) The document, available below, establishes a TMDL for fecal bacteria in Double Pipe Creek that will allow for attainment of the beneficial use designation of primary contact recreation. The listings for nutrients, suspended sediments, and impacts to biological communities will be addressed separately at a future date. A data solicitation for fecal bacteria was conducted by MDE in 2003, and all readily available data from the past five years were considered.

Total Maximum Daily Loads of Fecal Bacteria for Double Pipe Creek in Frederick and Carroll Counties, Maryland

(Approved on December 3, 2009)

EPA's Decision Letter

EPA's Decision Letter

Main Report

Double_Pipe_Bacteria_TMDL_Final.pdf (3,808KB)

Comment Response Document

Double_Pipe_CRD_Final.pdf (90KB)


Contact Information

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