The Malheur mottled sculpin is a small freshwater fish characterized by its mottled brown and tan coloration and wide, flattened head. It is endemic to the Malheur River basin in Oregon, where it inhabits cool, clear streams with rocky substrates. Typically, it reaches about 3-4 inches in length and weighs just a few ounces. It is benthic, feeding on small invertebrates, and tends to be solitary.