A bill to authorize the construction of a lock on the Mississippi River in the vicinity of Alton, Illinois and Missouri, and to authorize appropriations to carry out certain programs for the Upper Mississippi River System, and for other purposes.

Grants congressional approval of the Comprehensive Master Plan for the Management of the Upper Mississippi River System as a guide for future water policy on such System.

Authorizes the Secretary of the Army, acting through the Chief of Engineers, to provide for the engineering, design, and construction, of a second lock at locks and dam 26, Mississippi River, Alton, Illinois and Missouri. Authorizes appropriations.

Authorizes the Secretary of the Interior to undertake with respect to the Upper Mississippi River System: (1) a habitat rehabilitation and enhancement program; (2) the implementation of a long-term resource monitoring program; (3) the implementation of a computerized inventory and analysis system for data storage and retrieval; and (4) the implementation of a program of recreational projects. Authorizes appropriations.

Directs the Secretary of the Interior and the Secretary of the Army, acting through the Chief of Engineers, to: (1) review the Master Plan; (2) assign priorities; and (3) develop and submit to Congress a proposal for further implementation.

Declares that such Master Plan has reasonably complied with the provisions of the National Environmental Policy Act of 1969.