Custer County awards Riverside Road bridge replacement to Mainline Contracting for $639,491.25

May 7, 2025

Custer County Commissioners accepted the lowest responsible bid from Mainline Contracting, Inc. for the Riverside Road/Buffalo Gap East Main Street bridge replacement at $639,491.25, contingent on South Dakota DOT approval; the project is funded by a BIG grant with the county covering 20% (~$127,898.25).

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The Custer County Commission accepted a low bid of $639,491.25 from Mainline Contracting Inc. for the Riverside Road (Buffalo Gap East Main Street) bridge replacement project, Superintendent Doyle said during the bid opening.

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