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National Park Service health-risk determinations: E. Coli Levels Low risk: 177 colonies per 100 ml of water. Swimming, diving, wading has a LOW chance of getting sick. The water is in full compliance with recreation water quality criteria. High risk: 234 colonies per 100 ml of water. Contact with the river is NOT recommended if the level is High Risk. A person in direct contact with river water has an increased risk of getting sick. The water quality does NOT meet federal recreation water-quality criteria.
2010 Water Quality Testing Results 2009 Water Quality Testing Results 2008 Water Quality Testing Results 2007 Water Quality Testing Results 2006 Water Quality Testing Results
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Last updated: April 6, 2018