Records of the Montana Department of Highways Bridge Bureau. Records document the construction, repair, and inspection of bridges and associated structures (abutments, etc.) around Montana from the late 1910s to the 2000s, and are comprised of correspondence, diaries, minutes, and subject files.

Records of the Montana Department of Highways, and Montana Department of Transportation, Preconstruction Bureau. This collection consists of the records of public hearings for various roads projects, files of Bureau Chief Steve Kologi, and the work of the Preconstruction Bureau’s Environmental Landscape Unit. Also included are the Libby Dam Project Files.