Notice of Availability of a Final Environmental Impact Statement for Renovation of Crow Creek Dam on Crow Creek Indian Reservation, South Dakota

摘要

The Spillway at Crow Creek Dam is on the verge of failure. Failure of the spillway could lead to the catastrophic failure of the dam, endangering lives and property in the floodplain between the dam and Lake Francis Case on the Missouri River. During its 55-year life, the reservoir has trapped approximately 5,000 acre-feet of sediment which has reduced its water-storage capacity from 7,000 to 2,000 acre- feet. An Environmental Impact Statement (EIS) was necessary to address the impact of controlled or catastrophic release of the sediment. Six alternatives for renovation are considered in the document. This Notice is published in accordance with the National Environmental Policy Act (NEPA) regulations found in Parts 1500-1508 of 40 CFR.