D2 Interstate Culverts RFP

Description: The Montana Department of Transportation seeks proposals from consulting firms to prepare construction plans and specifications for the D2 Interstate Culverts project. The work covers analysis of three existing culverts at Bison Creek and Prickly Pear Creek on I-15 and Dry Creek on I-90, followed by design of the selected rehabilitation or replacement alternatives and related engineering and permitting. Proposals must be submitted electronically through Montana’s File Transfer Service by 3:00 PM MST on December 9, 2026.