43 U.S.C. § 619

(a) Hoover Powerplant generating equipment; increase in capacity; improvement of appurtenances; authorization of Secretary The Secretary of the Interior is authorized to increase the capacity of existing generating equipment and appurtenances at Hoover Powerplant (hereinafter in this subchapter referred to as “uprating program”); and to improve parking, visitor facilities, and roadways and to provide additional elevators, and other facilities that will contribute to the safety and sufficiency of visitor access to Hoover Dam and Powerplant (hereinafter in this subchapter referred to as “visitor facilities program”). (b) Construction of Colorado River bridge crossing; authorization of Secretary The Secretary of the Interior is authorized to construct a Colorado River bridge crossing, including suitable approach spans, immediately downstream from Hoover Dam for the purpose of alleviating traffic congestion and reducing safety hazards. This bridge shall not be a part of the Boulder Canyon project and shall neither be funded nor repaid from the Colorado River Dam Fund or the Lower Colorado River Basin Development Fund.