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

Lost contains a portion of 3 counties:

KLAMATH County, OR

MODOC County, CA

SISKIYOU County, CA

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

Number of Waterbodies with Reported Problems (as reported by the state): 15

Antelope Creek

Barnes Valley Creek

Horse Canyon Creek

Klamath River

Klamath River

Klamath River

Klamath Strait

Lapham Creek

Link River

Long Branch Creek

Lost River

Lost River Reservoir

Miller Creek

Upper Klamath Lake

Willow Creek, North Fork

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

Priority for Regulation	Number of Waterbodies
Targeted	0
High	0
Medium	1
Low	0
Not Assessed for TMDL Priority	14
Not Reported to US EPA for TMDL Priority	0

Rivers, Streams, and Creeks
Number of impaired waterbodies: 12
Percent of Rivers, Streams and Creeks in OREGON assessed by agencies for 1997-98 reporting period: 47%
Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%

	Percent Waterbodies Affected
Temperature	100%
Nutrients	33%
Low Dissolved Oxygen/Organic Enrichment	25%
pH	17%
Ammonia	8%
More...

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

Rivers, Streams, and Creeks
Number of impaired waterbodies: 12(cause not reported for 91%)
Percent of Rivers, Streams and Creeks in OREGON assessed by agencies for 1997-98 reporting period: 47%
Percent of Rivers, Streams and Creeks in CALIFORNIA assessed by agencies for 1997-98 reporting period: 8%

	Percent Waterbodies Affected
Impairment source not reported	92%
Agriculture	8%
Hydromodification/Habitat Modification	8%
Municipal Point Sources	8%
Nonpoint Sources	8%

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