USFWS proposes to designate critical habitat for the sickle darter (Percina williamsi) under the ESA. In total, approximately 104 river miles (168 river kilometers) in Bledsoe, Blount, Morgan, and Roane Counties, Tennessee, and Scott, Smyth, and Washington Counties, Virginia, fall within the boundaries of the proposed critical habitat designation. If finalized this would extend the Act's protections to this species' critical habitat. They also announce the availability of a draft economic analysis of the proposed designation of critical habitat for the sickle darter. They will accept comments received or postmarked on or before 27 March 2023. POC is Daniel Elbert, Field Supervisor, USFWS, Tennessee Ecological Services Field Office, 446 Neal Street, Cookeville, TN 38501; tele 931-528-6481. (Federal Register 24 January 2023 [Proposed Rule] Pages 4128-4150)