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National Assessment Database

Assessment Data for
Virginia, Middle Potomac-Anacostia-Occoquan Watershed (8 Digit USGS Cataloging Unit), Year 2006

Description of this table
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Click on the Water Name link to get 305(b) Lists/Assessment Unit Information Report

Table Legend: Water Status is GoodWater Status is Threatened Water Status is ImpairedWater Status has not been Assessed

Water Name Assessment Unit ID Location Map State Water Type Water Size Unit Water Status
Accotink Bay VAN-A15E_ACO01A06 Segment includes tidal waters of Accotink Creek until the confluence with the tidal waters of Pohick Bay/ Gunston Cove. Portion of CBP segment POTTF. No Mapping Data VA ESTUARY .349 SQUARE MILES IMPAIRED
Accotink Creek VAN-A15R_ACO02A00 Segment begins at the confluence with Crook Branch, upstream from Route 846, and continues downstream until the start of Lake Accotink. Map Assessed Water VA RIVER 4.8 MILES IMPAIRED
Accotink Creek VAN-A15R_ZZZ01A00 Potomac/Shenandoah Unassessed free-flowing segment of watershed of watershed A15R. Map Assessed Water VA RIVER 38.92 MILES NOT ASSESSED
Accotink Creek VAN-A15R_ACO04A02 Segment begins at the confluence with Daniels Run, in the City of Fairfax, and continues downstream until the confluence with Bear Branch. Map Assessed Water VA RIVER 1.19 MILES IMPAIRED
Accotink Creek VAN-A15R_ACO05A04 Segment begins at the confluence with an unnamed tributary to Accotink Creek, located in the upstream corridor of Ranger Park, and continues downstream until the confluence with Daniels Run. Map Assessed Water VA RIVER .85 MILES NOT ASSESSED
Accotink Creek VAN-A15R_ACO01A00 Segment begins at the confluence with Calamo Branch and continues downstream until the tidal waters of Accotink Bay. Map Assessed Water VA RIVER 8.62 MILES IMPAIRED
Accotink Creek VAN-A15R_ACO03A02 Segment begins at the confluence with Long Branch, at Eakin Park, and continues downstream until the confluence with Crook Branch. Map Assessed Water VA RIVER .88 MILES NOT ASSESSED
Backlick Run VAN-A13R_BAL01A00 Segment begins at the headwaters of Backlick Run, approximately 0.74 rivermile upstream from Route 620, and continues downstream until the confluence with Holmes Run. Map Assessed Water VA RIVER 6.45 MILES IMPAIRED
Belmont Bay VAN-A25E_OCC04A02 Segment extends 0.5 mile around the monitoring station 1AOCC-766-ALL (coordinates 38.647, -77.195). Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .416 SQUARE MILES IMPAIRED
Belmont Bay (Occoquan River) VAN-A25E_OCC03A04 Segment extends 0.5 mile around Coastal 2000 monitoring station 1AOCC002.62. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .392 SQUARE MILES IMPAIRED
Big Rocky Run VAN-A22R_BIR02A02 Segment begins at the confluence with an unnamed tributary to Big Rocky Run, at rivermile 6.45 in Rocky Run Park, and continues downstream until the confluence with another tributary to Big Rocky Run, at approximately rivermile 4.03. Map Assessed Water VA RIVER 2.42 MILES NOT ASSESSED
Big Rocky Run VAN-A22R_BIR01A02 Segment begins at the confluence with an unnamed tributary to Big Rocky Run, at approximately rivermile 4.03, and continues downstream until the confluence with Cub Run. Map Assessed Water VA RIVER 4.03 MILES NOT ASSESSED
Broad Run VAN-A19R_BRU08A04 Segment begins at the confluence with Mill Run and continues downstream to the confluence with Trapp Run. Map Assessed Water VA RIVER 1.06 MILES IMPAIRED
Broad Run VAN-A19R_BRU07B06 Segment begins at the confluence with Trapp Branch and continues downstream until the confluence with Catletts Branch. No Mapping Data VA RIVER 1.13 MILES IMPAIRED
Broad Run VAN-A19R_BRU03A04 Segment begins at the outlet from Lake Manassas and continues downstream until the confluence with Rocky Branch. Map Assessed Water VA RIVER 3.9 MILES GOOD
Broad Run VAN-A19R_BRU02A00 Segment begins at the confluence with Rocky Branch and continues downstream until the confluence with Cannon Branch. Map Assessed Water VA RIVER 7.26 MILES IMPAIRED
Broad Run VAN-A19R_BRU01A04 Segment begins at the confluence with Kettle Run and continues downstream until the confluence with Cedar Run, forming the Occoquan River/Lake Jackson. Map Assessed Water VA RIVER 2.23 MILES IMPAIRED
Broad Run VAN-A19R_BRU01B06 Segment begins at the confluence with Cannon Branch and continues downstream until the confluence with Kettle Run. No Mapping Data VA RIVER 2.05 MILES GOOD
Broad Run VAN-A19R_BRU07A02 Segment begins at the confluence with an unnamed tributary to Broad Run, at approximately rivermile 21.3, and continues downstream until the start, western end, of Lake Manassas. Map Assessed Water VA RIVER 1.51 MILES IMPAIRED
Broad Run/Kettle Run VAN-A19R_ZZZ01A00 Potomac/Shenandoah Unassessed segment of watershed A19R. Map Assessed Water VA RIVER 146.19 MILES NOT ASSESSED
Bull Run VAN-A21R_BUL02A00 Segment begins at the confluence with Chestnut Lick, approximately 0.7 rivermile upstream from Route 705, and continues downstream until the confluence with an unnamed tributary to Bull Run, at rivermile 22.34. No Mapping Data VA RIVER 4.37 MILES IMPAIRED
Bull Run VAN-A21R_BUL01C06 Segment begins at the confluence with Youngs Branch and continues downstream until the I-66 crossing. No Mapping Data VA RIVER 1.04 MILES GOOD
Bull Run VAN-A21R_BUL01B06 Segment begins at the I-66 crossing and continues downstream until the confluence with Flat Branch. No Mapping Data VA RIVER 2.54 MILES IMPAIRED
Bull Run VAN-A21R_BUL01A06 Segment begins at the confluence with Flat Branch and continues downstream until the confluence with Cub Run. No Mapping Data VA RIVER .18 MILES IMPAIRED
Bull Run VAN-A23R_BUL01C04 Segment begins at the confluence of Popes Head Creek with Bull Run and continues downstream until rivermile 5.8. No Mapping Data VA RIVER .95 MILES IMPAIRED
Bull Run VAN-A23R_BUL01A06 Segment begins at the boundary of the PWS designation area, at rivermile 5.18, and continues downstream until the beginning of the Occoquan Reservoir, at rivermile 2.89. No Mapping Data VA RIVER 2.27 MILES IMPAIRED
Bull Run VAN-A23R_BUL01B02 Segment begins at the Route 612 crossing, at rivermile 5.8, and continues downstream until the boundary of the PWS designation area, at rivermile 5.18. No Mapping Data VA RIVER .62 MILES IMPAIRED
Bull Run VAN-A23R_BUL02A02 Segment begins at the confluence with Cub Run, at the start of watershed A23R, and continues downstream until the confluence with Popes Head Creek. Map Assessed Water VA RIVER 4.8 MILES IMPAIRED
Burke Lake VAN-A16L_SOH01A06 Segment includes all of Burke Lake. No Mapping Data VA RESERVOIR 208 ACRES NOT ASSESSED
Calamo Branch VAN-A15R_CAL01A02 Segment begins at the headwaters of Calamo Branch and continues downstream until the confluence with Accotink Creek. Map Assessed Water VA RIVER 1.02 MILES NOT ASSESSED
Cameron Run VAN-A13R_ZZZ01A00 Potomac/Shenandoah Unassessed free-flowing segment of watershed A13R. Map Assessed Water VA RIVER 21.92 MILES NOT ASSESSED
Cameron Run/Hunting Creek VAN-A13R_CAM01A04 Segment begins at the confluence with Backlick Run and continues downstream until the Route 241 (Telegraph Road) bridge crossing. Map Assessed Water VA RIVER 2.12 MILES IMPAIRED
Catharpin Creek VAN-A21R_CAA01A02 Segment begins at the headwaters of Catharpin Creek and continues downstream until the confluence with Little Bull Run. Map Assessed Water VA RIVER 9.49 MILES GOOD
Catletts Branch VAN-A19R_CAE01A02 Segment begins at the headwaters of Catletts Branch and continues downstream until the confluence with Broad Run. Map Assessed Water VA RIVER 2.53 MILES NOT ASSESSED
Cedar Run VAN-A18R_CER01B06 Segment begins at the confluence with Goslin Run and continues downstream until the boundary of the PWS designation area, at rivermile 7.86. No Mapping Data VA RIVER 1.66 MILES IMPAIRED
Cedar Run VAN-A18R_CER02A02 Segment begins at the boundary of the PWS designation area, at rivermile 12.81, and continues downstream until the confluence with Goslin Run. Map Assessed Water VA RIVER 3.65 MILES IMPAIRED
Cedar Run VAN-A18R_CER02B06 Segment begins at the mouth of watershed A17R and continues downstream until the boundary of the PWS designation area, at rivermile 12.81. No Mapping Data VA RIVER .66 MILES IMPAIRED
Cedar Run VAN-A18R_CER01A02 Segment begins at the boundary of the PWS designation area, at rivermile 7.86, and continues downstream until the confluence with the Occoquan River/Lake Jackson. Map Assessed Water VA RIVER 8.18 MILES IMPAIRED
Cedar Run VAN-A17R_CER03B06 Segment begins at the confluence with Mill Run, approximately 1.2 rivermiles downstream from Route 672, and continues downstream until the boundary of the PWS designation area, at approximately rivermile 25.20. No Mapping Data VA RIVER 2.49 MILES IMPAIRED
Cedar Run VAN-A17R_CER03A02 Segment begins at the boundary of the PWS designation area, approximately rivermile 25.20, and continues downstream until the confluence with Turkey Run, approximately 0.15 rivermile upstream from Route 603. Map Assessed Water VA RIVER 4.31 MILES IMPAIRED
Cedar Run VAN-A17R_CER02A02 Segment begins at the confluence with Turkey Run, approximately 0.15 rivermile upstream from Route 603, and continues downstream until the confluence with Walnut Branch, at approximate rivermile 15.2. Map Assessed Water VA RIVER 5.65 MILES IMPAIRED
Cedar Run VAN-A17R_CER01A02 Segment begins at the confluence with Walnut Branch, at approximately rivermile 15.2, and continues downstream until the mouth of waterbody A17R. Map Assessed Water VA RIVER 1.63 MILES IMPAIRED
Cedar Run VAN-A17R_CER04A06 Segment begins at the outlet of the Warrenton Reservoir and continues downstream until the boundary of the PWS designation area, approximately 0.1 rivermile downstream from the Route 678 crossing. No Mapping Data VA RIVER 1.84 MILES GOOD
Crook Branch VAN-A15R_CRK01A02 Segment begins at the headwaters of Crook Branch and continues downstream until the confluence with Accotink Creek. Map Assessed Water VA RIVER 2.25 MILES NOT ASSESSED
Cub Run VAN-A22R_CUB01A00 Segment begins at the confluence with Elklick Run and continues downstream until the confluence with Bull Run. Map Assessed Water VA RIVER 6.75 MILES IMPAIRED
Cub Run VAN-A22R_CUB02A02 Segment begins at the confluence with an unnamed tributary to Cub Run, approximately 0.41 rivermile downstream from the confluence with Cain Branch, and continues downstream until the confluence with Flatlick Branch. Map Assessed Water VA RIVER 2.58 MILES GOOD
Cub Run VAN-A22R_ZZZ01A00 Potomac/Shenandoah Unassessed segment of watershed A22R. Map Assessed Water VA RIVER 50.08 MILES NOT ASSESSED
Daniels Run VAN-A15R_DAN01A06 Segment begins at the headwaters of Daniels Run and continues downstream until the confluence with Accotink Creek. No Mapping Data VA RIVER 2.58 MILES NOT ASSESSED
Dogue Creek VAN-A14E_DOU01A00 Segment includes all tidal waters of Dogue Creek, extending from approximately rivermile 2.1 until the confluence with the Potomac River. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .74 SQUARE MILES IMPAIRED
Dogue Creek VAN-A14R_DOU01A04 Segment begins at the confluence with an unnamed tributary to Dogue Creek, approximately 0.33 rivermiles upstream from Route One, and continues downstream until the end of the free-flowing waters of Dogue Creek. Map Assessed Water VA RIVER .86 MILES GOOD
Donaldson Run VAN-A12R_DON01A04 Segment begins at the headwaters of Donaldson Run and continues downstream until the confluence with the Potomac River. Map Assessed Water VA RIVER 1.58 MILES NOT ASSESSED
Elk Run VAN-A18R_ELK01A06 Segment begins at the headwaters of Elk Run and continues downstream until the confluence with an unnamed tributary to Elk Run, approximately 0.07 rivermiles downstream from Route 607. No Mapping Data VA RIVER 4.26 MILES GOOD
Elklick Run VAN-A22R_ELC02A06 Segment begins at the headwaters of Elklick Run and continues downstream until the confluence with an unnamed tributary to Elklick Run, approximately 0.65 rivermile downstream from the Route 620 crossing. No Mapping Data VA RIVER 1.77 MILES NOT ASSESSED
Elklick Run VAN-A22R_ELC01A04 Segment begins at the confluence with an unnamed tributary to Elklick Run, approximately 0.65 rivermile downstream from the Route 620 crossing, and continues downstream until the confluence with Cub Run. Map Assessed Water VA RIVER 2.16 MILES IMPAIRED
Field Lark Branch VAN-A15R_FLR01A02 Segment begins at the headwaters of Field Lark Branch and continues downstream until the confluence with Accotink Creek. Map Assessed Water VA RIVER 1.42 MILES NOT ASSESSED
Flatlick Branch VAN-A22R_FLL01A04 Segment begins at the confluence with Frog Branch and continues downstream until the confluence with Cub Run. Map Assessed Water VA RIVER 3.02 MILES GOOD
Fourmile Run VAN-A12E_FOU01A00 Segment includes the tidal waters of Fourmile Run; from rivermile 1.46 downstream until the confluence with the Potomac River, at the state line. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .052 SQUARE MILES IMPAIRED
Fourmile Run VAN-A12R_FOU01A00 Segment begins at the headwaters of Fourmile Run and continues downstream until rivermile 1.46, approximately 0.27 rivermile upstream from the Arlington Ridge Road bridge. Segment includes non-tidal waters of Fourmile Run. Map Assessed Water VA RIVER 7.88 MILES IMPAIRED
Giles Run VAN-A25R_GIL01A04 Segment begins at the headwaters of Giles Run and continues downstream until the end of the free-flowing waters of Giles Run, at Massey Creek. Map Assessed Water VA RIVER 5.59 MILES GOOD
Goslin Run VAN-A18R_GON01A04 Segment begins at the confluence with Goose Run and continues downstream until the confluence with Cedar Run. Map Assessed Water VA RIVER .75 MILES GOOD
Gulf Branch VAN-A12R_GUL01A04 Segment begins at the headwaters of Gulf Branch and continues downstream until the confluence with the Potomac River. Map Assessed Water VA RIVER 1.46 MILES NOT ASSESSED
Gunston Cove VAN-A15E_POH01A00 Segment extends from rivermile 1.31 in Gunston Cove until the confluence with the Potomac River. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY 1.51 SQUARE MILES IMPAIRED
Holmes Run VAN-A13R_HOR01A00 Segment begins at the mouth of Lake Barcroft and continues downstream until the confluence with Backlick Run. Map Assessed Water VA RIVER 3.59 MILES IMPAIRED
Holmes Run VAN-A13R_HOR01B00 Segment begins at the headwaters of Holmes Run and continues downstream until the start of Lake Barcroft. Map Assessed Water VA RIVER 5.8 MILES IMPAIRED
Hooes Run VAN-A24R_HOO01A02 Segment begins at the outlet from Lake Omiscol and continues downstream until the beginning of the inundated waters of the Occoquan Reservoir. Map Assessed Water VA RIVER 1.05 MILES NOT ASSESSED
Hooff Run VAN-A13E_HFF01A06 Segment contains the tidal portion of Hooff Run; begins at the Alexandria National Cemetery and continues downstream until the confluence with Hunting Creek. Portion of CBP segment POTTF. No Mapping Data VA ESTUARY .005 SQUARE MILES IMPAIRED
Hooff Run VAN-A13R_HFF01A02 Segment starts at the headwaters of Hooff Run and continues downstream until the end of the free-flowing waters of Hooff Run. Map Assessed Water VA RIVER .31 MILES NOT ASSESSED
Hunting Creek/Potomac River/Belle Haven VAN-A13E_HUT01A02 Segment includes all tidal waters of Hunting Creek; beginning at the Route 241 (Telegraph Road) bridge crossing and continuing downstream until the confluence with the Potomac River, to include the embayment. Portion of CBP segment POTTF. No Mapping Data VA ESTUARY 1.36 SQUARE MILES IMPAIRED
Indian Run VAN-A14R_INA01A06 Segment begins at the headwaters of Indian Run and continues downstream until the confluence with Backlick Run. No Mapping Data VA RIVER 2.98 MILES IMPAIRED
Johnny Moore Creek VAN-A23R_JOH01A02 Segment begins at the confluence with an unnamed tributary to Johnny Moore Creek, approximately 0.13 rivermile downstream from Route 3546, and continues downstream until the confluence with Bull Run. Map Assessed Water VA RIVER 3.78 MILES NOT ASSESSED
Kettle Run VAN-A19R_KET02A04 Segment begins at the confluence with an unnamed tributary to Kettle Run, just upstream from Route 602, and continues downstream until the confluence with another unnamed tributary to Kettle Run, at approximately rivermile 10.5. Map Assessed Water VA RIVER 3.46 MILES IMPAIRED
Kettle Run VAN-A19R_KET01A00 Segment begins at the confluence with an unnamed tributary to Kettle Run, approximately 0.08 rivermile upstream from Route 708, and continues downstream until the confluence with Broad Run. Map Assessed Water VA RIVER 7.59 MILES IMPAIRED
Lake Manassas (Broad Run Reservoir) VAN-A19L_BRU02A02 Segment includes the lower portion of the lake; beginning at the sailing line confluence of North Fork to Broad Run and continues downstream until the dam/spillway. It does not include the lake arm extending upstream on North Fork. Map Assessed Water VA RESERVOIR 192 ACRES NOT ASSESSED
Lake Manassas (Broad Run Reservoir) VAN-A19L_BRU03A02 Segment includes the middle portion of the lake; beginning at the sailing line confluence with an unnamed tributary to Broad Run (near the pipeline crossing) and continues downstream until the start of segment BRU02A02. It does not include the lake arms. Map Assessed Water VA RESERVOIR 164 ACRES NOT ASSESSED
Lake Manassas (Broad Run Reservoir) VAN-A19L_BRU04A02 Segment includes the upper portion of the lake; beginning at the start of Lake Manassas and continues downstream until the start of segment BRU03A02 (near the pipeline crossing). It does not include the lake arms. Map Assessed Water VA RESERVOIR 189 ACRES NOT ASSESSED
Lake Manassas (Broad Run Reservoir) VAN-A19L_ZZZ01A02 Remaining unassessed portion of Lake Manassas. Map Assessed Water VA RESERVOIR 192 ACRES NOT ASSESSED
Licking Run VAN-A17R_LIL02B06 Segment begins at the headwaters of Licking Run and continues downstream until the boundary of the PWS designation area, at rivermile 11.32. No Mapping Data VA RIVER 3.28 MILES IMPAIRED
Licking Run VAN-A17R_LIL02A04 Segment begins at the boundary of the PWS designation area, at rivermile 11.32, and continues downstream until the start of Germantown Lake. Map Assessed Water VA RIVER 3.49 MILES IMPAIRED
Licking Run VAN-A17R_LIL01B06 Segment begins at Route 602, below the mouth of Germantown Lake, and continues downstream until the boundary of the PWS designation area. No Mapping Data VA RIVER .24 MILES IMPAIRED
Licking Run VAN-A17R_LIL01A00 Segment begins at the boundary of the PWS designation area, approximately 0.24 rivermile downstream from Route 602, and continues downstream until the confluence with Cedar Run. Map Assessed Water VA RIVER 6.34 MILES IMPAIRED
Little Bull Run VAN-A21R_LII02A02 Segment begins at the confluence with Catharpin Creek, approximately 0.55 rivermile upstream from Route 704, and continues downstream until the confluence with Lick Branch. Map Assessed Water VA RIVER 3.03 MILES GOOD
Little Bull Run VAN-A21R_LII03A06 Segment begins at the headwaters of Little Bull Run and continues downstream until the confluence with Catharpin Creek. No Mapping Data VA RIVER 9.46 MILES NOT ASSESSED
Little Bull Run VAN-A21R_LII01A02 Segment begins at the confluence with Lick Branch and continues downstream until the confluence with Bull Run. Map Assessed Water VA RIVER 1.85 MILES NOT ASSESSED
Little Hunting Creek VAN-A14E_LIF01A00 Segment includes all tidal waters of Little Hunting Creek, extending from approximately rivermile 1.7 downstream until the confluence with the Potomac River. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .248 SQUARE MILES IMPAIRED
Little Rocky Run VAN-A23R_LIP01A06 Segment begins at the confluence with Willow Springs and continues downstream until the confluence with Bull Run. No Mapping Data VA RIVER 4.98 MILES GOOD
Long Branch VAN-A15R_LOA01A02 Segment begins at the headwaters of Long Branch and continues downstream until the confluence with Accotink Creek, in Eakin Park at rivermile 19.46. Map Assessed Water VA RIVER 2.68 MILES NOT ASSESSED
Long Branch VAN-A15R_LOE01A02 Segment begins at the confluence with an unnamed tributary to Long Branch, at the Route 651 (Guinea Road) bridge, and continues downstream until the confluence with Accotink Creek, at rivermile 14.32 just below Braddock Road. Map Assessed Water VA RIVER 2.24 MILES NOT ASSESSED
Lower Bull Run/Popes Head Creek VAN-A23R_ZZZ01A00 Potomac/Shenandoah Unassessed segment of watershed A23R. Map Assessed Water VA RIVER 42.15 MILES NOT ASSESSED
Lower Cedar Run/Town Run VAN-A18R_ZZZ01A00 Potomac/Shenandoah Unassessed segment of watershed. Map Assessed Water VA RIVER 123.06 MILES NOT ASSESSED
Lucky Run VAN-A18R_LUC01A04 Segment begins at the headwaters of Lucky Run and continues downstream until the confluence with Cedar Run. Map Assessed Water VA RIVER 3.36 MILES GOOD
Marumsco Creek VAN-A25R_MAU01A04 Segment begins at the confluence with an unnamed tributary to Marumsco Creek, just upstream from Easy Street, and continues downstream until the end of the free-flowing waters. Map Assessed Water VA RIVER .75 MILES GOOD
Mills Branch VAN-A25R_WLB01A02 Segment begins at the headwaters of Mills Branch and continues downstream until the confluence with the Occoquan River. Mills Branch, a channeled flow under the Lorton landfill, is an unnamed tributary on the Occoquan/Ft. Belvoir quads. Map Assessed Water VA RIVER 1.81 MILES IMPAIRED
Neabsco Bay VAN-A25E_NEA01A00 Segment includes the tidal waters of Neabsco Bay downstream until the confluence with Occoquan Bay. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .795 SQUARE MILES IMPAIRED
Neabsco Creek VAN-A25R_NEA01A00 Segment begins at the confluence with an unnamed tributary to Neabsco Creek, near Dale City and approximately 0.4 rivermile downstream from Route 784 (on the tributary) and continues downstream until the start of the tidal waters of Neabsco Bay. Map Assessed Water VA RIVER 8.8 MILES IMPAIRED
Neabsco Creek VAN-A25E_NEA20A02 Segment begins at the upstream limit of the tidal waters on Neabsco Creek and continues downstream until the start of the open waters of Neabsco Bay, approximately 0.5 rivermile upstream from monitoring station 1ANEA000.57. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .23 SQUARE MILES IMPAIRED
Occoquan Bay VAN-A25E_OCC02A00 Segment extends 0.5 mile around the around the monitoring station 1AOCC002.47. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .592 SQUARE MILES IMPAIRED
Occoquan Bay VAN-A25E_OCC01A04 Segment extends 0.5 mile around the Coastal 2000 monitoring station 1AOCC000.06. The downstream limit is the state line at the Potomac River. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .48 SQUARE MILES IMPAIRED
Occoquan Bay/Belmont Bay VAN-A25E_OCC20A02 Segment includes all waters of the Occoquan and Belmont Bays not included in other delineated segments. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY 5.393 SQUARE MILES IMPAIRED
Occoquan Bay/Belmont Bay VAN-A25E_POT20A02 Segment includes all tidal waters in watershed not included in other delineated stream segments. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .244 SQUARE MILES IMPAIRED
Occoquan Reservoir VAN-A24L_OCC02A06 Segment includes the upper Bull Run arm of the Occoquan Reservoir; extending from rivermile 2.89 on Bull Run downstream until the crossing of the Route 612 (Yates Ford Road) bridge. No Mapping Data VA RESERVOIR 63 ACRES IMPAIRED
Occoquan Reservoir VAN-A24L_OCC01A02 Segment includes most of the Occoquan Reservoir; extending from rivermile 19.83 on the Occoquan River and rivermile 2.89 on Bull Run downstream until the dam, located at rivermile 7.14 on the Occoquan. Map Assessed Water VA RESERVOIR 1265 ACRES IMPAIRED
Occoquan River VAN-A20R_OCC01A04 Segment begins at the confluence with Purcell Branch and continues downstream until the start of the Occoquan Reservoir. Map Assessed Water VA RIVER 3.07 MILES IMPAIRED
Occoquan River VAN-A20R_OCC02A00 Segment begins downstream from the Lake Jackson impoundment and extends downstream until the confluence with Purcell Branch. Map Assessed Water VA RIVER 1.61 MILES IMPAIRED
Occoquan River VAN-A25E_OCC05A02 Segment extends from 0.5 rivermile upstream until 0.5 rivermile downstream of monitoring station 1AOCC006.71. Portion of CBP segment POTTF. No Mapping Data VA ESTUARY .052 SQUARE MILES IMPAIRED
Occoquan River - Reservoir VAN-A24R_ZZZ01A00 Potomac/Shenandoah Unassessed segment of watershed A24R. Map Assessed Water VA RIVER 33.71 MILES NOT ASSESSED
Paul Spring Branch VAN-A14R_PAU01A04 Segment begins at the headwaters of Paul Spring Branch and continues downstream until the confluence with North Branch. Map Assessed Water VA RIVER 3.13 MILES NOT ASSESSED
Pimmit Run VAN-A12R_PIM01A00 Segment begins at the confluence with Little Pimmit Run, approximately 0.1 rivermile downstream from Route 695, and continues downstream until the confluence with the Potomac River. Map Assessed Water VA RIVER 1.63 MILES IMPAIRED
Pimmit Run VAN-A12R_PIM02A00 Segment begins at the Route 309 bridge crossing, at rivermile 4.16, and continues downstream until the confluence with Little Pimmit Run, approximately 0.1 rivermile downstream from Route 695. Map Assessed Water VA RIVER 2.53 MILES IMPAIRED
Pimmit Run VAN-A12R_PIM02B06 Segment begins at the headwaters of Pimmit Run, approximately 0.12 rivermile upstream from Route 7, and continues downstream until the Route 309 bridge crossing, at rivermile 4.16. No Mapping Data VA RIVER 3.22 MILES IMPAIRED
Piney Branch VAN-A23R_PIY01A02 Segment begins at the confluence of x-trib to Piney Branch, approx. 0.23 rivermiles upstream from Popes Head Road, and continues downstream to the confluence with Popes Head Creek. Map Assessed Water VA RIVER 1.68 MILES NOT ASSESSED
Pohick Bay VAN-A16E_POH01A06 Segment includes tidal waters of Pohick Creek upstream from the boundary of watershed A16. Portion of CBP segment POTTF. No Mapping Data VA ESTUARY .294 SQUARE MILES IMPAIRED
Pohick Bay VAN-A15E_POH02A00 Segment includes tidal waters of Pohick Creek, from the boundary of watershed A15, and extends until rivermile 1.31 in Gunston Cove. Portion of CBP segment POTTF. Map Assessed Water VA ESTUARY .611 SQUARE MILES IMPAIRED
Pohick Creek VAN-A16R_POH04A02 Segment begins at the confluence with Rabbit Branch, adjacent to the railroad tracks, and continues downstream until the confluence with Sideburn Branch. Map Assessed Water VA RIVER .45 MILES NOT ASSESSED
Pohick Creek VAN-A16R_ZZZ01A00 Potomac/Shenandoah Unassessed segment of watershed A16R. Map Assessed Water VA RIVER 35.61 MILES NOT ASSESSED
Pohick Creek VAN-A16R_POH03A04 Segment begins at the confluence with Sideburn Branch and continues downstream until the confluence with an unnamed tributary to Pohick Creek, at rivermile 14.18. Map Assessed Water VA RIVER 1.52 MILES IMPAIRED
Pohick Creek VAN-A16R_POH02A02 Segment begins at the confluence of an unnamed tributary to Pohick Creek, at rivermile 14.18, and continues downstream until the confluence with Middle Run. Map Assessed Water VA RIVER 4.95 MILES NOT ASSESSED
Pohick Creek VAN-A16R_POH01A00 Segment begins at the confluence with South Run, approximately 0.25 rivermile upstream from I-95, and continues downstream until the end of the free-flowing portion of Pohick Creek. Map Assessed Water VA RIVER 3.2 MILES IMPAIRED
Popes Head Creek VAN-A23R_POE01A00 Segment begins at the confluence with Piney Branch, approximately 0.25 rivermile downstream from Route 660, and continues downstream until the confluence with Bull Run. Map Assessed Water VA RIVER 4.92 MILES IMPAIRED
Popes Head Creek VAN-A23R_POE02A02 Segment begins at the confluence with an unnamed tributary to Popes Head Creek, approximately 0.13 rivermile upstream from Fairfax Station Road, and continues downstream until the confluence with Piney Branch. Map Assessed Water VA RIVER .33 MILES NOT ASSESSED
Potomac River/Dogue Creek/Little Hunting Creek VAN-A14R_ZZZ01A00 Potomac/Shenandoah Unassessed free-flowing segment of watershed A14R. Map Assessed Water VA RIVER 22.68 MILES NOT ASSESSED
Potomac River/Fourmile Run/Pimmit Run VAN-A12R_ZZZ01A00 Potomac/Shenandoah Unassessed free-flowing segment of watershed A12R. Map Assessed Water VA RIVER 12.69 MILES NOT ASSESSED
Potomac River/Lower Occoquan River/Neabsco Creek VAN-A25R_ZZZ01A00 Potomac/Shenandoah Unassessed free-flowing segment of watershed A25R. Map Assessed Water VA RIVER 41.64 MILES NOT ASSESSED
Purcell Branch VAN-A20R_PUR01A06 Segment begins at the headwaters of Purcell Branch, near Woodbine School, and continues downstream until the confluence with the Occoquan Reservoir, at rivermile 23.23. No Mapping Data VA RIVER 3.16 MILES IMPAIRED
Sandy Run VAN-A24R_SAD01A04 Segment begins at the headwaters of Sandy Run and continues downstream until the end of the free-flowing waters at the inundated waters of the Occoquan Reservoir. Map Assessed Water VA RIVER 5.8 MILES GOOD
Sideburn Branch VAN-A16R_SID01A02 Segment begins at the outlet from Woodglen Lake and continues downstream until the confluence with an unnamed tributary to Pohick Creek, which is the outlet from Lake Barton. Map Assessed Water VA RIVER 2.21 MILES NOT ASSESSED
South Run VAN-A19R_SOT01A00 Segment begins downstream of Lake Brittle on South Run and continues downstream until the confluence with Lake Manassas (Broad Run). Map Assessed Water VA RIVER 2.34 MILES IMPAIRED
Spout Run VAN-A12R_SPU01A04 Segment begins at the headwaters of Spout Run and continues downstream until the confluence with the Potomac River. Map Assessed Water VA RIVER 1.15 MILES NOT ASSESSED
Trapp Branch VAN-A19R_TRA01A06 Segment begins at the confluence with an unnamed tributary to Trapp Branch, approximately 0.08 rivermile downstream from the Route 696 crossing, and continues downstream until the confluence with Broad Run. No Mapping Data VA RIVER 1.49 MILES IMPAIRED
Tripps Run VAN-A13R_TRI01A00 Segment begins at the headwaters of Tripps Run and continues downstream until the start of Lake Barcroft. Map Assessed Water VA RIVER 2.25 MILES IMPAIRED
Turkey Run VAN-A17R_TUK01A06 Segment begins at the confluence with an unnamed tributary to Turkey Run, approximately 0.25 rivermile upstream from the Route 602 crossing, and continues downstream until the confluence with Cedar Run, at rivermile 20.89. No Mapping Data VA RIVER 3.62 MILES IMPAIRED
Unnamed tributary to Accotink Creek VAN-A15R_XKY01A06 Segment begins at the headwaters of an unnamed tributary to Accotink Creek and continues downstream until the confluence with Accotink Creek, at rivermile 19.87. No Mapping Data VA RIVER 1.71 MILES NOT ASSESSED
Unnamed tributary to Big Rocky Run VAN-A22R_XJK01A02 Segment begins at the headwaters of an unnamed tributary to Big Rocky Run and continues downstream until the confluence with Big Rocky Run, at rivermile 2.94. Map Assessed Water VA RIVER .73 MILES NOT ASSESSED
Unnamed tributary to Pimmit Run VAN-A12R_XKS01A06 Segment begins at the headwaters of an unnamed tributary to Pimmit Run and continue downstream until the confluence with Pimmit Run. No Mapping Data VA RIVER .62 MILES NOT ASSESSED
Unnamed tributary to Piney Branch VAN-A23R_XJL01A02 Segment begins at the headwaters of an unnamed tributary to Piney Branch and continues downstream until the confluence with Piney Branch. Map Assessed Water VA RIVER .33 MILES NOT ASSESSED
Unnamed tributary to Popes Head Creek VAN-A23R_XJM01A02 Segment begins at the headwaters of an unnamed tributary to Popes Head Creek and continues downstream until the confluence with Popes Head Creek, at rivermile 1.13. Map Assessed Water VA RIVER 1.22 MILES NOT ASSESSED
Unnamed tributary to Sandy Run VAN-A24R_XJN01A02 Segment begins at the headwaters of an unnamed tributary to Sandy Run and continues downstream until the confluence with Sandy Run, at rivermile 1.66. Map Assessed Water VA RIVER 1.33 MILES NOT ASSESSED
Unnamed tributary to Slate Run VAN-A18R_XKU01A06 Segment begins at the headwaters of an unnamed tributary to Slate Run and continues downstream until the confluence with Slate Run, at rivermile 4.19. No Mapping Data VA RIVER 1.92 MILES NOT ASSESSED
Upper Bull Run/Little Bull Run VAN-A21R_ZZZ01A00 Potomac/Shenandoah Unassessed segment of watershed A21R. Map Assessed Water VA RIVER 100.77 MILES NOT ASSESSED
Upper Cedar Run/Licking Run VAN-A17R_ZZZ01A00 Potomac/Shenandoah Unassessed segment of watershed A17R. Map Assessed Water VA RIVER 118.8 MILES NOT ASSESSED
Upper Occoquan River/Lake Jackson VAN-A20R_ZZZ01A00 Potomac/Shenandoah Unassessed segment of watershed A20R. Map Assessed Water VA RIVER 28.19 MILES NOT ASSESSED
Walnut Branch VAN-A17R_WAL01A06 Segment begins at the confluence with an unnamed tributary, just upstream from the railroad crossing, and continues downstream until the confluence with Cedar Run, at rivermile 15.16. No Mapping Data VA RIVER 1.67 MILES GOOD
Wolf Run VAN-A24R_WOL01A06 Segment begins at the confluence with Maple Branch and continues downstream until the end of the free-flowing waters at the inundated waters of the Occoquan Reservoir. No Mapping Data VA RIVER 2.17 MILES IMPAIRED
Youngs Branch VAN-A21R_YOU01A02 Segment begins at the headwaters of Youngs Branch and continues downstream until the confluence with Bull Run. Map Assessed Water VA RIVER 5.64 MILES NOT ASSESSED

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State Causes of Impairment

Virginia, Middle Potomac-Anacostia-Occoquan Watershed

Description of this table
State Cause Name Size of Assessed Waters with Listed Causes of Impairment
Rivers, Streams, Creeks (Miles) Lakes, Ponds, Reservoir (Acres) Bays, Estuaries (Square Miles) Coastal Shorelines (Miles) Oceans, Near Coastal Waters (Square Miles) Wetlands (Acres) Great Lakes Shoreline (Miles) Great Lakes Open Waters (Square Miles) Inland Lake Shoreline (Miles) Great Lakes Connecting Channel (Miles)
AQUATIC PLANTS (MACROPHYTES) .00 .00 27.53 .00 .00 .00 .00 .00 .00 .00
ESTUARINE BIOASSESSMENTS .00 .00 .78 .00 .00 .00 .00 .00 .00 .00
BENTHIC-MACROINVERTEBRATE BIOASSESSMENTS (STREAMS) 57.46 .00 .00 .00 .00 .00 .00 .00 .00 .00
PCB IN FISH TISSUE 43.40 126.00 27.53 .00 .00 .00 .00 .00 .00 .00
CHLORDANE 3.26 .00 .00 .00 .00 .00 .00 .00 .00 .00
ESCHERICHIA COLI 236.48 .00 3.32 .00 .00 .00 .00 .00 .00 .00
BENZO[K]FLUORANTHENE 6.40 .00 .00 .00 .00 .00 .00 .00 .00 .00
PH .00 .00 2.77 .00 .00 .00 .00 .00 .00 .00
HEPTACHLOR EPOXIDE 3.26 .00 .00 .00 .00 .00 .00 .00 .00 .00
OXYGEN, DISSOLVED .00 2,656.00 .00 .00 .00 .00 .00 .00 .00 .00
FECAL COLIFORM 99.50 .00 5.09 .00 .00 .00 .00 .00 .00 .00

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Probable Sources Contributing to Impairment

Virginia, Middle Potomac-Anacostia-Occoquan Watershed

 Description of this table
State Source Name Size of Assessed Waters with Probable Sources of Impairment
Rivers, Streams, Creeks (Miles) Lakes, Ponds, Reservoir (Acres) Bays, Estuaries (Square Miles) Coastal Shorelines (Miles) Oceans, Near Coastal Waters (Square Miles) Wetlands (Acres) Great Lakes Shoreline (Miles) Great Lakes Open Waters (Square Miles) Inland Lake Shoreline (Miles) Great Lakes Connecting Channel (Miles)
MANURE RUNOFF 34.81 .00 .00 .00 .00 .00 .00 .00 .00 .00
SEWAGE DISCHARGES IN UNSEWERED AREAS 4.80 .00 .00 .00 .00 .00 .00 .00 .00 .00
CLEAN SEDIMENTS .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
WET WEATHER DISCHARGES (POINT SOURCE AND COMBINATION OF STORMWATER, SSO OR CSO) .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
ILLICIT CONNECTIONS/HOOK-UPS TO STORM SEWERS 12.68 .00 .00 .00 .00 .00 .00 .00 .00 .00
NATURAL CONDITIONS - WATER QUALITY STANDARDS USE ATTAINABILITY ANALYSES NEEDED .00 1,328.00 .00 .00 .00 .00 .00 .00 .00 .00
INTERNAL NUTRIENT RECYCLING .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
LOSS OF RIPARIAN HABITAT .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
WILDLIFE OTHER THAN WATERFOWL 34.81 .00 .00 .00 .00 .00 .00 .00 .00 .00
AGRICULTURE .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
WASTES FROM PETS 12.68 .00 .00 .00 .00 .00 .00 .00 .00 .00
SEDIMENT RESUSPENSION (CLEAN SEDIMENT) .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
MUNICIPAL POINT SOURCE DISCHARGES .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
GRAZING IN RIPARIAN OR SHORELINE ZONES 34.81 .00 .00 .00 .00 .00 .00 .00 .00 .00
IMPERVIOUS SURFACE/PARKING LOT RUNOFF 4.80 .00 .00 .00 .00 .00 .00 .00 .00 .00
INDUSTRIAL POINT SOURCE DISCHARGE .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
SOURCE UNKNOWN 133.74 63.00 13.76 .00 .00 .00 .00 .00 .00 .00
SOURCES OUTSIDE STATE JURISTICTION OR BORDERS .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
ATMOSPHERIC DEPOSITION - NITROGEN .00 .00 13.76 .00 .00 .00 .00 .00 .00 .00
WATERFOWL 47.49 .00 .00 .00 .00 .00 .00 .00 .00 .00

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Clicking anywhere on this watershed map will take you to the Enviromapper for Water website, where you can view and map various types of environmental information for the watershed. This information includes Superfund sites, water discharge permits, toxic releases, and more.

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