Still Creek is a free-flowing tributary of the Northeast Branch of the Anacostia River; the stream joins the Northeast Branch near at the eastern edge of the city limits of Riverdale Park. The subwatershed is generally bound by Greenbelt Road and I-495 to the north and east, Good Luck Road to the south, and Edmonston Road to the west. The entire Still Creek subwatershed is in Prince George's County and includes communities in Greenbelt, Berwyn Heights and New Carrollton.
Dominant Land Uses: The dominant land uses in the Still Creek subwatershed are forest cover (55%) and residential/commercial development (32%). Approximately 43% of the watershed is owned by the U.S. Department of the Interior and operated as Greenbelt National Park.
Physical Characteristics: The Still Creek subwatershed is 2,554.9 acres (4.0 mi2) in size and approximately 15% impervious. The entire watershed is located on the coastal plain, with elevations ranging from 70 feet at the subwatershed divide to 10 feet at the confluence with the Northeast Branch.
Biological Characteristics: The state of Maryland has designated Still Creek as suitable for recreation and protection of wildlife. From the limited data available, it seems that Still Creek supports a fairly health fish population, while the benthic macroinvertebrate population is rather poor.
Condition Summary: As a large part of the Still Creek subwatershed is federally owned and managed by the National Park Service as Greenbelt National Park, the majority of the watershed is forested. However, Still Creek is affected by runoff from the residential and commercial development surrounding Greenbelt National Park and the Baltimore-Washington Parkway, which bisects the watershed. Increased stormwater runoff from these developed areas and pollutants in the runoff are causing erosion and water quality problems in Still Creek. Preliminary surveys by COG staff indicate that approximately 20% of the streambanks are experiencing accelerated erosion. In addition, the work done to construct Kenilworth Avenue in the 1950s resulted in portions of lower Still Creek being channelized. This has resulted in the creation of several instream blockages preventing the movement of both resident and migratory fishes. Preliminary surveys by COG revealed five fish blockages in the middle and lower mainstem of Still Creek.