Description
Rainbow River is located heads at central terminus of Serpent Tongue Glacier, flows NW to Savonoski River, on Alaska Peninsula, in Katmai National Monument, 21 mi. NE of Mount Katmai, Aleutian Range
History
So named in 1923 by R. H. Sargent's U.S. Geological Survey (USGS) party "because six rainbows were seen there."