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Section 303(d) List Fact Sheet for Watershed
Gunpowder-Patapsco

Other Impaired Water 303(d) List Information
Data are also available for these years:

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Number of Waters listed by State for Watershed

State Name Waters on List Effective Listing Cycle
MARYLAND color.gif 26 2006
Total Number of Waters Listed: 26

Waters Listed By Waterbody

NOTE: Click on the underlined "Waters on List" value to see a listing of those waters.
Waterbody Name Waterbody Type Waters on List
ABERDEEN PROVING GROUND STREAM/CREEK/RIVER color.gif 1
ATKISSON RESERVOIR STREAM/CREEK/RIVER color.gif 2
BACK RIVER STREAM/CREEK/RIVER color.gif 1
BUSH RIVER STREAM/CREEK/RIVER color.gif 2
BYNUM RUN STREAM/CREEK/RIVER color.gif 1
GWYNNS FALLS STREAM/CREEK/RIVER color.gif 1
JONES FALLS LAKE/RESERVOIR/POND color.gif 1
LIBERTY RESERVOIR LAKE/RESERVOIR/POND color.gif 3
LIBERTY RESERVOIR STREAM/CREEK/RIVER color.gif 4
LITTLE GUNPOWDER FALLS STREAM/CREEK/RIVER color.gif 1
LOCH RAVEN RESERVOIR STREAM/CREEK/RIVER color.gif 1
LOWER GUNPOWDER FALLS STREAM/CREEK/RIVER color.gif 1
LOWER WINTERS RUN STREAM/CREEK/RIVER color.gif 1
PATAPSCO RIVER LOWER NORTH BRANCH STREAM/CREEK/RIVER color.gif 1
PRETTYBOY RESERVOIR STREAM/CREEK/RIVER color.gif 1
SOUTH BRANCH PATAPSCO RIVER STREAM/CREEK/RIVER color.gif 3
SWAN CREEK STREAM/CREEK/RIVER color.gif 1
Total Number of Listed Waters: 26

Causes of Impairment

NOTE: Click on the underlined "Causes of Impairment Reported" value to see a listing of those waters with the impairment.
Impairment Name Causes of Impairment Reported Percent of Reported
BIOLOGICAL color.gif 20 55.56
NUTRIENTS color.gif 6 16.67
SEDIMENT color.gif 5 13.89
TOXICS color.gif 3 8.33
BACTERIA color.gif 1 2.78
METALS - MERCURY color.gif 1 2.78
Total Number of Causes of Impairment Reported: 36

Approved TMDLs by Pollutants since October 1, 1995
NOTE: Click on the underlined "Pollutant" value to see associated listed waters for which a TMDL was developed. Click on the underlined "Number of TMDLs Approved" value to see a listing of those approved TMDLs for the pollutant. EPA is in the process of collecting TMDL information from the states. Because these efforts are on-going, there may be additional approved TMDLs that were not included in the listings below.
Pollutant Number of TMDLs Approved Percent of Reported
NITROGEN color.gif 6 27.27
E. COLI color.gif 4 18.18
SUSPENDED SEDIMENT color.gif 3 13.64
PHOSPHORUS color.gif 3 13.64
CHLORDANE color.gif 1 4.55
PCBS color.gif 1 4.55
BIOLOGICAL color.gif 1 4.55
LEAD color.gif 1 4.55
SEDIMENT color.gif 1 4.55
METHYL MERCURY color.gif 1 4.55
Total Number of Approved TMDLs since October 1, 1995: 22

Approved TMDLS by EPA Fiscal Year (October 1 through September 30) since October 1, 1995
Fiscal Year Number of TMDLs Approved Percent Approved
2000 color.gif 1 4.55
2001 color.gif 1 4.55
2003 color.gif 1 4.55
2004 color.gif 8 36.36
2005 color.gif 4 18.18
2007 color.gif 3 13.64
2008 color.gif 1 4.55
2010 color.gif 3 13.64

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