Hoover Dam and the Mike O’Callaghan-Pat Tillman Memorial Bridge are seen from the Colorado River’s Black Canyon at Lake Mead National Recreation Area outside of Las Vegas on Wednesday, Oct. 17, 20 …

Hoover Dam and the Mike O’Callaghan-Pat Tillman Memorial Bridge are seen from the Colorado River’s Black Canyon at Lake Mead National Recreation Area outside of Las Vegas on Wednesday, Oct. 17, 2018. (Las Vegas Review-Journal)