Population Density: 4,854/mi2 Forest Cover: (63.9%)
-1936/38 0.42% mi2: 59.4%
-2000: 0.46 mi2; 63.9%
Wetland Cover: 0.0%
- Palustrine: None
- Riverine: None
- Lacustrine: None
|Local Watershed Group: NA|
Dominant Land Uses: The two dominant land uses in the Ft. Dupont subwatershed include parkland/forest cover/institutional and water(87.5%) and medium-density residential residential (6.1%).
Physical Characteristics: The Ft. Dupont subwatershed is 460 acres (0.72 mi2) in size and approximately 11.0% impervious. Elevations range from 308 feet at the subwatershed divide to 29.5 feet at the confluence with the tidal Anacostia River. A seven-foot high vertical drop associated with the lower CSX culvert precludes the normal movement and exchange of fish between river and stream. Stream gradient for the Fort Dupont mainstem is at 2.2, relatively high for a Coastal Plain stream. This high gradient is largely a function of the stream's river terrace-influenced morphology.
Biological Characteristics: Fort Dupont is designated as a Class ‘A’, ‘B’, ‘C’, and ‘D’ stream (i.e., Class ‘A’= Primary Contact Recreation; ‘B’= Secondary Contact Recreation and Aesthetic Enjoyment; ‘C’= Protection and Propagation of Fish, Shellfish and Wildlife; and ‘D’= Protection of Human Health Related to Consumption of Fish and Shellfish) by the District Department of the Environment (DDOE). All (i.e., 6 out of 6) of the Fort Dupont Index of Biotic Integrity (IBI) main stem and tributary sampling stations were rated as having non-supporting physical aquatic habitat conditions present. The condition of macroinvertebrate populations in both the Fort Dupont main stem and tributary network is poor. During non-drought years, the Fort Dupont main stem downstream of Texas Avenue is capable of supporting the American eel and pioneer fish species such as blacknose dace and northern creek chubs. This was confirmed by reintroductions of these two pioneer species (with successful recruitment) by COG and NPS in 2000. Unfortunately, the stream ceases to flow during severe droughts and it has few large, deep pools which could serve as refugia for fish. In general, both main stem and tributary aquatic communities remain impacted.
Several physical barriers to both resident and anadromous fish movement and migration are present (e.g., weirs, piped stream sections, etc). These, as well as other barriers in Fort Dupont have been identified and remain as a restoration challenge for this subwatershed. It should be noted that efforts on the part of DDOE and NPS to control stormwater runoff, restore both tributary and main stem instream habitat, create wetlands, reforest riparian corridors, and reintroduce migratory fish to the subwatershed remain on-going.
Condition Summary:Fort Dupont has the most forest, is the least densely populated and is the least altered stream within the District of Columbia’s portion of the Anacostia. Approximately 36 percent of the total subwatershed area is developed, and roughly 89 percent of the stream miles have an adequate riparian forest buffer (i.e., 300-foot total width). Not surprisingly, far more stormwater retrofitting and stream restoration efforts are needed to restore the aquatic ecosystem of the Fort Dupont subwatershed. Planned future projects include, but are not limited to: stormwater management focusing on the employment of low impact development (LID) and environmentally sensitive design (ESD), wetland creation, aquatic and terrestrial habitat restoration, fish barrier modification/removal, invasive plant management, trash reduction and potentially additional fish reintroductions.