South Fork Clearwater River

Kooskia, Idaho

SWIMMING IS UNADVISABLE DUE TO HIGH WATER LEVELS AND UNSAFE RUNOFF
South Fork Clearwater River at Kooskia, ID

The South Fork Clearwater River is a 62-mile (100 km)long river in north-central Idaho in the United States. The South Fork joins with the Middle Fork Clearwater River to form the Clearwater River, a major tributary of the Snake River. The river is formed by the confluence of the American River and Red River in the Nez Perce National Forest at an elevation of 3,901 ft (1,189 m). The mouth of the river
is on the Clearwater at Kooskia, at an elevation of 1,224 ft.

Historically, the Grangeville (Harpster) Dam was built on the South Fork in 1910 for hydroelectricity generation. In 1963, the dam was demolished, restoring the river's populations of Chinook salmon and steelhead trout. Today, the entire South Fork and its headwater tributaries are free flowing and unobstructed by dams or major diversions.

WATER QUALITY
  • Passed water quality tests at least 95% of the time
  • Historical Status
  • This status is based on the latest sample, taken on June 30th, 2018. Snake River Waterkeeper updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on at
For water quality icon legend, click:   
CURRENT WEATHER
2°C
Clear and sunny
MONITORING FREQUENCY

South Fork Clearwater River is sampled from June 7th to August 30th

SOURCE INFORMATION

There is currently very limited water quality monitoring of Idaho's inland swim sites. The federal Beach Act does not cover freshwater or riverine beaches, and states in the Basin do not monitor Snake River swimming beaches or recreational access sites.

As part of its Water Quality Program, Snake River Waterkeeper monitors water quality at more than 100 sites on the Snake River and its tributaries for temperature, dissolved oxygen, pH, salinity/conductivity/total dissolved solids, ammonia, and nitrates. Data are collected at sample sites June-October and assigned safety ratings based on comparison to EPA's Recreational Water Quality Criteria for Human Health:

pH: 5 – 9 µg/L
Salinity/Conductivity/Total Dissolved Solids: 500 mg/L
Nitrates: 10 mg/L

A site is marked Green when single sample results meet all Human Health Criteria.
A site is marked Red when the results are equal to or above Human Health Criteria.
A site is marked Grey when there are no current results or no available information.
Sites found to exceed EPA's Aquatic Health Criteria are noted in site descriptions.

While criteria measured are useful indicators of contamination, there are many other potential sources of pollution that are not reflected in our Swim Guide, including E.coli and other bacteria, heavy metals, pharmaceuticals, fertilizers, and pesticides that harm aquatic life.

Download the free app for smartphone and learn about Swim Guide 3.0 at www.theswimguide.org. To learn more about our efforts to protect and restore the Snake River's water quality, visit www.snakeriverwaterkeeper.org.

WATER QUALITY GRAPH

South Fork Clearwater River

Kooskia, Idaho

WATER QUALITY
  • Passed water quality tests at least 95% of the time
  • Historical Status
  • This status is based on the latest sample, taken on June 30th, 2018. Snake River Waterkeeper updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on at
For water quality icon legend, click:   
CURRENT WEATHER
2°C
Clear and sunny

SWIMMING IS UNADVISABLE DUE TO HIGH WATER LEVELS AND UNSAFE RUNOFF
South Fork Clearwater River at Kooskia, ID

The South Fork Clearwater River is a 62-mile (100 km)long river in north-central Idaho in the United States. The South Fork joins with the Middle Fork Clearwater River to form the Clearwater River, a major tributary of the Snake River. The river is formed by the confluence of the American River and Red River in the Nez Perce National Forest at an elevation of 3,901 ft (1,189 m). The mouth of the river
is on the Clearwater at Kooskia, at an elevation of 1,224 ft.

Historically, the Grangeville (Harpster) Dam was built on the South Fork in 1910 for hydroelectricity generation. In 1963, the dam was demolished, restoring the river's populations of Chinook salmon and steelhead trout. Today, the entire South Fork and its headwater tributaries are free flowing and unobstructed by dams or major diversions.

MONITORING FREQUENCY

South Fork Clearwater River is sampled from June 7th to August 30th

SOURCE INFORMATION

There is currently very limited water quality monitoring of Idaho's inland swim sites. The federal Beach Act does not cover freshwater or riverine beaches, and states in the Basin do not monitor Snake River swimming beaches or recreational access sites.

As part of its Water Quality Program, Snake River Waterkeeper monitors water quality at more than 100 sites on the Snake River and its tributaries for temperature, dissolved oxygen, pH, salinity/conductivity/total dissolved solids, ammonia, and nitrates. Data are collected at sample sites June-October and assigned safety ratings based on comparison to EPA's Recreational Water Quality Criteria for Human Health:

pH: 5 – 9 µg/L
Salinity/Conductivity/Total Dissolved Solids: 500 mg/L
Nitrates: 10 mg/L

A site is marked Green when single sample results meet all Human Health Criteria.
A site is marked Red when the results are equal to or above Human Health Criteria.
A site is marked Grey when there are no current results or no available information.
Sites found to exceed EPA's Aquatic Health Criteria are noted in site descriptions.

While criteria measured are useful indicators of contamination, there are many other potential sources of pollution that are not reflected in our Swim Guide, including E.coli and other bacteria, heavy metals, pharmaceuticals, fertilizers, and pesticides that harm aquatic life.

Download the free app for smartphone and learn about Swim Guide 3.0 at www.theswimguide.org. To learn more about our efforts to protect and restore the Snake River's water quality, visit www.snakeriverwaterkeeper.org.

WATER QUALITY GRAPH



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