Cott Tank Drainage is a small perennial drainage downstream of Cott Tank, which is tributary to Redrock Canyon. Redrock Canyon historically supported a relict population of Gila topminnow. Topminnow are believed to be extirpated following the introduction of western mosquitofish, which are now found in pools in the Cott Tank drainage. Future management actions include the removal of non-native western mosquitofish and the reintroduction of Redrock Canyon lineage Gila topminnow.
