Watershed Size: Approximately 284 sq mi / 181,503 acres.

Location: Limestone and Madison Counties AL; Giles and Lincoln Counties TN.

Priority Species: 

Crayfish:  Alabama Cave Crayfish, White Spring Cave Crayfish.

Fish:  Spring Pygmy Sunfish, Slackwater Darter, Tuscumbia Darter, Chucky Madtom.

Mussels:  Tennessee Pigtoe, Pale Lilliput, Painted Creekshell (H), Spike (H), Finerayed Pigtoe (H), Longsolid (H), Tennessee Clubshell (H), Slabside Pearlymussel (H). 

Reptiles and Amphibians:  Tennessee Cave Salamander.

Snails:  Anthony's Riversnail, Slender Campeloma, Armored Marstonia, Moss Pyrg, Skirted Hornsnail.

(H) = Historic (species historically occurred in the SHU or SRRU but, it has either not been collected in a number of years, and may be considered extirpated, or the species could be present but there aren’t recent records to document its presence).