The purpose of the hearing is to receive testimony on S. 2891, a bill to further allocate and expand the availability of hydroelectric power generated at Hoover Dam, and for other purposes; S. 2779/H.R.3671, a bill to promote Department of the Interior efforts to provide a scientific basis for the management of sediment and nutrient loss in the Upper Mississippi River Basin, and for other purposes; S. 3387, a bill to provide for the release of water from the marketable yield pool of water stored in the Ruedi Reservoir for the benefit of endangered fish habitat in the Colorado River, and for other purposes; S.3404, a bill to amend the Reclamation Projects Authorization and Adjustment Act of 1992 to require the Secretary of the Interior, acting through the Bureau of Reclamation, to take actions to improve environmental conditions in the vicinity of the Leadville Mine Drainage Tunnel in Lake County, Colorado, and for other purposes; and H.R. 4252 to direct the Secretary of the Interior to conduct a study of water resources in the Rialto-Colton Basin in the State of California, and for other purposes (Hearing Room SD- 366).