The Timber Bridges-Forsyth Area project will replace 12 aging bridges in southeastern Montana with new bridges or culverts, impacting US Highway 12 (US 12) between Ingomar and Forsyth.
The Montana Department of Transportation (MDT) proactively invests in and improves Montana’s aging infrastructure. This investment maintains Montana’s vital connections and protects the traveling public.
Why is this project important?
The Timber Bridges-Forsyth Area project aims to keep Montana’s bridges safe, resilient, economical, and reliable. The MDT Bridge Bureau is responsible for over 5,000 bridges in the state and inspects, evaluates, replaces, rehabilitates, and preserves structures under its jurisdiction.
The aging timber structures are deteriorating and have limited serviceable life remaining. MDT has determined that replacing this bridge bundle through a design-build contract is the most cost-effective approach.
What does this mean to me?
The design phase is the public’s opportunity to provide MDT with information and feedback regarding the local use of these bridges and nearby roadways. There will be further opportunities to provide input as MDT develops plans for each bridge.
Process and Anticipated Schedule
Phase 1 Preliminary Design – November 2021 – September 2023
- MDT and the Phase 1 Consultant (TD&H Engineering) will gather preliminary information at each bridge site
- Develop reasonable solutions for replacing the existing bridges
- Provide MDT with a summary of all information gathered
- MDT to solicit design-build requests for proposals in Fall 2023
Phase 2 Final Design and Construction – October 2023 – Fall 2025
- Final construction plans will be developed by Spring 2024
- Construction is scheduled for Spring 2024 – Fall 2025
Preliminary cost estimates are being developed as part of the Phase 1 Preliminary Design.
|MDT Structure ID||Feature Intersected||Location||Route||Mile Marker||County|
|05497||DRAINAGE||35 Mi NW Forsyth||US 12||235.872||Rosebud|
|05498||DRAINAGE||32 Mi NW Forsyth||US 12||238.172||Rosebud|
|05499||DRAINAGE||32 Mi NW Forsyth||US 12||238.979||Rosebud|
|05500||DRAINAGE||31 Mi NW Forsyth||US 12||239.812||Rosebud|
|05502||DRAINAGE||25 Mi NW Forsyth||US 12||245.311||Rosebud|
|05504||HORSE CREEK||20 Mi NW Forsyth||US 12||250.562||Rosebud|
|05505||ANDERSON CREEK||19 Mi NW Forsyth||US 12||252.09||Rosebud|
|05506||DRAINAGE||18 Mi NW Forsyth||US 12||253.022||Rosebud|
|05507||STOCKPASS-DRAINAGE||16 Mi NW Forsyth||US 12||254.501||Rosebud|
|05508||STOCKPASS||14 Mi NW Forsyth||US 12||256.999||Rosebud|
|05511||DRAINAGE||12 Mi NW Forsyth||US 12||258.366||Rosebud|
|05512||STOCKPASS||12 Mi NW Forsyth||US 12||258.552||Rosebud|
Engineer to English
Phase 1 Preliminary Engineering – Phase 1 services are needed to understand and analyze the project and formulate a design for all sites. The information provided through Phase 1 analysis will be utilized in the design-build process. Phase 1 will provide investigation, analysis, and design services, including surveys; hydraulic analysis; geotechnical exploration; environmental investigation; concept roadway and bridge design; public involvement; cost estimation and risk analysis; traffic management and construction phasing recommendations; right-of-way design and potentially right-of-way acquisition.
Design-Build – A project delivery system that combines a project’s design and construction services into a single contract. Teamwork between the design engineer and contractor helps project teams to develop better solutions, reduce project costs, maintain quality, and expedite project delivery. All work is completed per state and federal design standards, specifications, and contract administration practices. Design-build is helpful for completing unique and challenging projects like this one.
MDT has undertaken an ambitious goal through Vision Zero to eliminate deaths and serious injuries on Montana’s highways. MDT is working toward Vision Zero to ensure Montana’s thousands of miles of state roads and highways are built and maintained with safety as the first concern. MDT is committed to providing transportation systems and safe and affordable services, protecting the environment, and supporting economic growth in Montana.
Public involvement is vital to MDT and the success of the project. As the project progresses, the community will be notified about public involvement opportunities via this website, local media, postcards, social media channels, and other means
MDT encourages questions and comments about the project. You can submit them through the MDT Comment Form or directly to our team at