NMFS, announce a 12-month finding on a petition to revise the critical habitat designation under the ESA for the Southern California steelhead (Oncorhynchus mykiss) distinct population segment (DPS). The petition from the United Water Conservation District (UWCD) requests the removal of an approximately 9-mile (14.5-kilometer (km)) stream reach from the confluence of Hopper Creek and the Santa Clara River to the face of Santa Felicia Dam. Based on our review of the best scientific and commercial data available, they find that the petitioned action to remove this reach from the critical habitat designation is warranted. Consequently, they are proposing to remove this reach from the critical habitat designation for Southern California steelhead. Comments on this proposed rule must be received by 28 August 2026. POC is Robert Markle, NMFS West Coast Region, robert.markle@noaa.gov or 503-230-5419. (Federal Register 29 June 2026 [Proposed Rule] Pages 39046-39054)