Cleanest/Best Watersheds

National Average

Dirtiest/Worst Watersheds

0%					50%					100%

Percentage of Surface Waters with Impaired or Threatened Uses (state + EPA data):

Number of Impaired Waterbodies (as reported by the state):

NOTE: Data limitations affect the accuracy of these rankings.

Rank watersheds by assessed use impairments
Rank counties by assessed use impairments.
Rank states by assessed use impairments, impairments due to specific causes, or impairments due to specific sources

Horn Lake-Nonconnah contains a portion of 3 counties:

DESOTO County, MS

MARSHALL County, MS

SHELBY County, TN

Percentage of Surface Waters with Reported Problems (state + EPA data): 100%

Number of Waterbodies with Reported Problems (as reported by the state): 8

Cypress Creek South

Horn Lake Cr

Horn Lake Creek- Da

John's Creek

Nonconnah Cr

Nonconnah Cr

Nonconnah Creek

Nonconnah Creek- Da

Beneficial Use Most Frequently Impaired	Percent of All Impairments
Not Reported	75%
Aquatic Life Support	25%

Priority for Regulation	Number of Waterbodies
Targeted	0
High	6
Medium	0
Low	0
Not Assessed for TMDL Priority	2
Not Reported to US EPA for TMDL Priority	0

Rivers, Streams, and Creeks
Number of impaired waterbodies: 8
Percent of Rivers, Streams and Creeks in MISSISSIPPI assessed by agencies for 1997-98 reporting period: 47%
Percent of Rivers, Streams and Creeks in TENNESSEE assessed by agencies for 1997-98 reporting period: 88%

	Percent Waterbodies Affected
Low Dissolved Oxygen/Organic Enrichment	62%
Pathogens	62%
Metals	50%
Nutrients	50%
Pesticides	38%
More...

NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.

Rivers, Streams, and Creeks
Number of impaired waterbodies: 8(cause not reported for 25%)
Percent of Rivers, Streams and Creeks in MISSISSIPPI assessed by agencies for 1997-98 reporting period: 47%
Percent of Rivers, Streams and Creeks in TENNESSEE assessed by agencies for 1997-98 reporting period: 88%

	Percent Waterbodies Affected
Urban Runoff/Storm Sewers	75%
Combined Sewer Overflows	62%
Impairment source not reported	25%
Contaminated Sediments	12%
Municipal Point Sources	12%

NOTE: Possible inconsistencies between data on (a) impaired waterbodies and (b) percentage of waterbodies assessed.

U.S. EPA Watershed Health Index

U.S. EPA Condition and Vulnerability Indicators

U.S. EPA Watershed Profile

U.S. Geological Survey: Water Resources Links

USGS report on the National Water-Quality Assessment (NAWQA) study unit this watershed is in.