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Project Overview

The Montana Department of Transportation (MDT) and Frontier West are rehabilitating the bridge that carries Secondary Highway 382 (S 382) over the Flathead River near Perma. This bridge was originally constructed in the 1960s and needs repairs. This project will extend the service life of this bridge.


Work on this project began in summer 2023 and is anticipated to be completed in 2024.

Work completed in 2023 included:

  • Replacing damaged bearings and joints.
  • Repairing girders.
  • Hydro milling and overlaying the bridge deck (driving surface) with new concrete.
  • Upgraded bridge railing.

Construction activities planned for 2024:

  • Painting portions of the steel substructure to slow corrosion.
  • Installing advance warning rumble strips and signage for the intersection of S 382 with Montana Highway 200 (MT 200).
  • Paving bridge approaches.
  • Apply final striping.

What is Hydro Milling?

Hydro milling is a technique that removes deteriorated concrete using high-pressure water. This process allows the contractor to remove the top layer of concrete without causing additional damage to the bridge deck.

Example of hydro milling.

Example of hydro milling.

UPN: 9808000