Water Quality Criteria for the Snake River at Flagg Ranch, Wyoming

The upper Snake River, located wholly within National Park Service and U.S. Forest Service boundaries, is designated as Outstanding or Class 1 waters by the State of Wyoming. In Wyoming, this designation indicates that high quality waters are known to support fish or supply drinking water and no further degradation by point source discharges other than from dams is allowed. The Snake River is also protected by the Craig Thomas Snake Headwaters Legacy Act of 2008 (PL 111-11), a 2009 amendment to the Wild and Scenic Rivers Act of 1968.

Water quality monitoring results from the Snake River at Flagg Ranch, WY, are compared to the following federal and state water quality standards.

EPA National Recommended Water Quality Criteria

EPA Gold Book

Wyoming Department of Environmental Quality Water Quality Rules and Regulations