Initiation of Status Review for Mountain Whitefish (Prosopium williamsoni) in the Big Lost River, Idaho

We, the U.S. Fish and Wildlife Service (Service), announce the initiation of a status review for mountain whitefish (Prosopium williamsoni) in the Big Lost River, Idaho. The status review will help us determine whether this population warrants listing as threatened or endangered under the Endangered Species Act of 1973, as amended (Act). At the conclusion of the review, we will issue a 12-month finding on our determination as to whether listing is warranted. If listing is warranted, we will also determine whether or not to propose critical habitat for mountain whitefish in the Big Lost River.