A bill to authorize modernization and improvement of the Belle Fourche project and to integrate the project into the Pick-Sloan Missouri Basin program.

Modifies the Belle Fourche Irrigation project, South Dakota, to include construction, betterment of works, land rehabilitation, water conservation, recreation, fish and wildlife conservation and development, and silt control. Redesignates such project as the "Belle Fourche Unit" of the Pick-Sloan Missouri Basin program.

Authorizes the Secretary of the Interior to negotiate and execute an amendatory repayment contract with the Belle Fourche Irrigation District covering all lands of the existing Belle Fourche project. Limits the period for repayment of the construction and rehabilitation and betterment costs by irrigation water users to not more than 40 years.

Permits costs incurred under the provisions of this Act to be covered by appropriations for the Bureau of Reclamation.