Convict Grade Road Bridge over Shields River


Design, Permitting completed Nov 2018-Jan 2019

Permit Approvals completed (anticipated) Feb 1st, 2019

Structure procurement completed Dec 20th, 2018

Contract Award to TCA, LLC Jan 31st, 2019

Notice to Proceed Issued January 31st, 2019

Substantial Completion May 1st, 2019


On October 15, 2018, the Montana Department of Transportation (MDT) conducted an underwater inspection of a bridge located on Convict Grade Road, crossing the Shields River (MDT Structure #03819).  The inspection revealed a large scour hole beneath the center concrete pier.  This finding caused MDT to close the bridge to all traffic on October 16th, 2018.  A temporary detour bridge was opened to traffic with a 10 ton Load Limit on October 31st, 2018 and the replacement of the existing bridge is underway.


Funding for this unproject is sourced from the Road & Bridge Capital Improvement fund; the Emergency & Disaster Fund 2260.  Park County also recieved an  Emergency Grant from the Treasure State Endowment Program for $30,000.   The current project costs and commitments are as follows:

Convict Grade Bridge Expenditures
Emergency Detour Bridge- TCA, LLC  $    37,500
Precast Beams- Forterra Precast Conc.  $  131,757
Construction- TCA, LLC  $  283,397
Engineering: Emergency, Design, Const.- Stahly   $    49,500
 $  502,154