Montana Federal Lands Management Act of 1990

Montana Federal Lands Management Act of 1990 - Sets forth the findings and purposes of this Act.

Title I: Wilderness Designation - Designates certain lands in the National Forest System in Montana as components of the National Wilderness Preservation System.

Incorporates the Great Bear Wilderness Area and the Scapegoat Wilderness Area into the Bob Marshall Wilderness.

Permits the installation of hydrological, meteorological, or climatological collection devices and ancillary facilities, and the use of wheelchairs on specified wilderness areas in Montana.

Provides for acquisition of water rights by the United States.

Requires that livestock grazing be continued and administered on such wilderness areas.

Title II: Roadless Area Release - Releases certain national forest lands in Montana from further roadless area administrative and judicial review. Releases specified lands for multiple use management according to the Land and Resource Management Plans for the National Forests in the State of Montana.

Title III: Plum Creek Land Exchange - Directs the Secretary of Agriculture to exchange specified lands with Plum Creek Timber Company, L.P. Requires the Secretary to acquire, by exchange and a specified sum, certain lands of the Company in and adjacent to the Hyalite-Porcupine-Buffalo Horn Wilderness Study Area, the Scapegoat Wilderness Area, and other land in the Gallatin National Forest. Expresses the sense of the Congress that this acquisition should be completed within 90 days of enactment. Authorizes appropriations.

Authorizes the Secretary of Agriculture to acquire mineral interests owned by the Company or an affiliate underlying federally-owned land in exchange for other federally-owned mineral interests.