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

South Fork Trinity contains a portion of 2 counties:

HUMBOLDT County, CA

TRINITY County, CA

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

Number of Waterbodies with Reported Problems (as reported by the state): 2

Summit Creek

Trinity River, South Fork

Beneficial Use Most Frequently Impaired	Percent of All Impairments
Not Reported	100%

Priority for Regulation	Number of Waterbodies
Targeted	0
High	1
Medium	0
Low	0
Not Assessed for TMDL Priority	0
Not Reported to US EPA for TMDL Priority	1

Rivers, Streams, and Creeks
Number of impaired waterbodies: 2
Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%

	Percent Waterbodies Affected
Nutrients	50%
Sediments	50%
Temperature	50%

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

Rivers, Streams, and Creeks
Number of impaired waterbodies: 2
Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%

	Percent Waterbodies Affected
Agriculture	50%
Construction	50%
Hydromodification/Habitat Modification	50%
Nonpoint Sources	50%
Silviculture	50%

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