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

Lake Tahoe contains a portion of 5 counties:

CARSON CITY County, NV

DOUGLAS County, NV

EL DORADO County, CA

PLACER County, CA

WASHOE County, NV

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

Number of Waterbodies with Reported Problems (as reported by the state): 6

Blackwood Creek

Heavenly Valley Creek

Lake Tahoe

Truckee River

Truckee River Basin: Lake Tahoe At Sand Harbor

Ward Creek

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

Priority for Regulation	Number of Waterbodies
Targeted	0
High	5
Medium	1
Low	0
Not Assessed for TMDL Priority	0
Not Reported to US EPA for TMDL Priority	0

Rivers, Streams, and Creeks
Number of impaired waterbodies: 4
Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%
Percent of Rivers, Streams and Creeks in NEVADA assessed by agencies for 1997-98 reporting period: 1%

	Percent Waterbodies Affected
Sediments	100%

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

Rivers, Streams, and Creeks
Number of impaired waterbodies: 4
Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%
Percent of Rivers, Streams and Creeks in NEVADA assessed by agencies for 1997-98 reporting period: 1%

	Percent Waterbodies Affected
Construction	75%
Nonpoint Sources	75%
Hydromodification/Habitat Modification	50%
Other Sources	25%
Resource Extraction	25%
More...

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.