Please Note: The following table shows the known, extant distributions of the federal Threatened and Endangered mid-Snake River mollusc species according to the Snake River Basin Fish and Wildlife Office, Boise, and recent Valvata utahensis surveys conducted by the Idaho Conservation Center.

Physa natricina Snake River Physa	Mainstem Snake River: King Hill (Clover Creek) to Minidoka Dam Counties: Elmore, Owyhee, Gooding, Twin Falls, Jerome, Cassia, Minidoka
Taylorconcha serpenticola Bliss Rapids Snail	Mainstem Snake River: King Hill (Clover Creek) to mouth of Blackfoot River Counties: Elmore, Owyhee, Gooding, Twin Falls, Jerome, Cassia, Minidoka, Blaine, Power, Bingham, Bannock
Valvata utahensis Desert Valvata	Mainstem Snake River: Lower Salmon Falls Dam to just upstream of the confluence of the South Fork Snake River and Henrys Fork Counties: Gooding, Twin Falls, Jerome, Cassia, Minidoka, Blaine, Power, Bingham, Bonneville, Jefferson, Madison
Lanx sp. Banbury Springs Lanx	Spring systems, mainstem Snake River: Thousand Springs to Banbury Springs Counties: Gooding, Twin Falls
Pyrgulopsis bruneauensis Bruneau Hot Springsnail	County: Owyhee