Water Quality Criteria for the Lamar River near Tower Ranger Station, Wyoming

Under the Clean Water Act, the surface waters in Yellowstone National Park are classified as Outstanding National Resource Waters. Additionally, these waters, located wholly within national park boundaries, are designated as Outstanding Resource Waters in Montana (Administrative Rules of Montana 17.30.617) or Class 1 Outstanding Natural Resource Waters in Wyoming. In Wyoming, this designation indicates that high quality waters are known to support fish or supply drinking water and no further water quality degradation by point source discharges other than from dams will be allowed.

Lamar River water quality monitoring results are compared to the following federal and state water quality standards.

EPA National Recommended Water Quality Criteria

Environmental Protection Agency (EPA). 1987. Quality criteria for water 1986 [The Gold Book]. EPA440/5-86-001. U.S. EPA, Office of Water Regulations and Standards, Washington D.C.

Wyoming Surface Water Quality Standards, Chapter 1, Water Quality Rules