The US Fish and Wildlife Service ‘announce a 12-month finding on a petition to list the slenderclaw crayfish (Cambarus cracens) as an endangered or threatened species under the Endangered Species Act... The slenderclaw crayfish is a relatively small, cryptic freshwater crustacean that is endemic to streams on Sand Mountain within the Tennessee River Basin in DeKalb and Marshall Counties, Alabama. After review of the best available scientific and commercial information, [the Service] find that listing the slenderclaw crayfish is warranted,’ and therefore propose to list it as a threatened species. The US Fish and Wildlife Service is also proposing a rule ‘that provides measures that are necessary and advisable to provide for the conservation of the slenderclaw crayfish. In addition, [the Service] propose to designate approximately 78 river miles (126 river kilometers) in Alabama as critical habitat for the species.’ A draft economic analysis of the proposed designation of critical habitat is available. Comments are requested on crayfish biology, management, economic impacts, and more.