A bill to authorize the construction of a lock and dam project on the Mississippi River near Alton, Ill., to revoke authority for 12-foot channel studies on the upper Mississippi River and its tributaries.

Authorizes the Secretary of the Army, acting through the Chief of Engineers, to construct a replacement lock and dam project on the Mississippi River near Alton, Illinois. Authorizes the Secretary to undertake steps to provide for wildlife protection and recreational activities in conjunction with such project.

Withdraws all authority for the Secretary of the Army to construct or study the feasibility of construction or modification of channels in the Mississippi River north of its juncture with the Illinois River.

Directs the Upper Mississippi River Basin Commission to prepare a master plan by 1981 for the management of the Upper Mississippi River. Requires public hearings on a preliminary plan prior to preparation of a final plan.

Establishes criteria to be considered in preparing such master plan. Authorizes the appropriation of $20,000,000 to the Commission for such study.