 Because of these objections, United States Secretary of the Interior Stewart Udall formally opposed construction of the dam in 1967, and the project was shelved. The U.S. Army Corps of Engineers nevertheless completed its engineering study of the project in 1971, and the final report was released to the public in 1979. In 1980, U.S. President Jimmy Carter created the Yukon Flats National Wildlife Sanctuary, which formally protected the area from development and disallowed any similar project.
