August 4, 2025
Construction continues this week on multiple structures along U.S. Highway 12 (US 12) as part of the Timber Bridges – Forsyth Area project.
Gravel and/or pulverized material currently cover all sites with newly installed bridge structures (Bridge IDs 5496, 5497, and 5508). The speed limit over these structures is 35 mph. No additional traffic impacts are expected at these sites.
Crews are working Monday through Saturday at Bridge ID 5499, located at milepost 238, approximately 1.3 miles southeast of West Blacktail Road, to continue installing the new drainage structure. This structure has a gravel/milled surface with a speed limit of 35 mph. Expect single-lane traffic when driving through the site.
At Bridge ID 5500, located at milepost 239, approximately 2 miles southeast of West Blacktail Road, crews will be preparing the site for the upcoming work. This structure has a gravel/milled surface with a speed limit of 35 mph.
Please drive with caution, especially in areas with uneven surfaces, and watch for crews and equipment in the work zone.
July 28, 2025
Construction continues this week on multiple structures along U.S. Highway 12 (US 12) as part of the Timber Bridges – Forsyth Area project.
Gravel and/or pulverized material currently cover all sites with newly installed bridge structures (Bridge IDs 5496, 5497, and 5508). These locations will see surface maintenance this week. No additional traffic impacts are expected at these sites.
Work continues at Bridge ID 5499, located at milepost 238, approximately 1.3 miles southeast of West Blacktail Road. This week, crews will begin installing the new drainage structure at this location. Work is scheduled Monday through Wednesday and will require reduced speeds and single-lane restrictions. Bridge ID 5500, located at milepost 239, approximately 2 miles southeast of West Blacktail Road, is covered by a gravel surface but will not see active work this week.
Drivers are reminded that the posted speed limit remains reduced to 35 mph throughout the corridor. Please drive with caution, especially in areas with uneven surfaces, and watch for crews and equipment in the work zone.
July 21, 2025
Construction continues this week on multiple structures along U.S. Highway 12 (US 12) that are part of the Timber Bridges – Forsyth Area project.
At the drainage bridge just east of Swanson Lane (Bridge ID 5508), backfilling is complete. Gravel and/or pulverized material currently cover all three sites with newly installed bridge structures (Bridge IDs 5496, 5497, and 5508). The posted speed limit remains reduced to 35 mph at each location. Drivers are urged to travel cautiously and watch for uneven surfaces.
These three locations will undergo slope grading activities and concrete preparation and pouring, with no additional impact on traffic.
Crews are also beginning work at two additional drainage bridge sites along US 12: Bridge ID 5499 (approximately 1.3 miles southeast of West Blacktail Road) and Bridge ID 5500 (approximately 2 miles southeast of West Blacktail Road). Roadway milling and surface preparation at these new sites are scheduled to begin Monday and will require reduced speeds and single-lane restrictions.
Thank you for slowing down and driving carefully through the work zone. Your attention and caution help keep everyone safe.
July 14, 2025
Construction continues this week on multiple structures that are part of the Timber Bridges – Forsyth Area project.
Gravel and/or pulverized material currently cover all three active bridge sites. The posted speed limit remains reduced to 35 mph through each location. Please drive cautiously and watch for uneven surfaces.
At the drainage bridges just west of Ingomar (mile marker 229, Bridge ID 5496) and about 2 miles northwest of West Blacktail Road (mile marker 236, Bridge ID 5497), traffic continues to travel over the new structures on gravel.
At the third location, just east of Swanson Lane (mile marker 257, Bridge ID 5508), crews are finishing backfilling operations. Work is scheduled Monday through Wednesday of this week. There will be no work on the roadway the rest of the week. Motorists should expect reduced speeds, a gravel driving surface, and a one-lane detour both during and outside of working hours.
Thank you for slowing down and driving carefully through the work zone. Your attention and caution help keep everyone safe.
July 7, 2025
Construction is resuming this week on the Timber Bridges – Forsyth Area project following the 4th of July holiday.
Gravel and/or pulverized material currently cover all three active bridge sites. The posted speed limit remains reduced to 35 mph through each location. Please drive cautiously and watch for uneven surfaces.
At the drainage bridges just west of Ingomar (mile marker 229, Bridge ID 5496) and about 2 miles northwest of West Blacktail Road (mile marker 236, Bridge ID 5497), traffic continues to travel over the new structures on gravel.
At the third location, just east of Swanson Lane (mile marker 257, Bridge ID 5508), crews will resume work this week. They will remove the existing bridge and continue installing the new drainage structure. Motorists should expect reduced speeds and a minor detour.
Looking ahead, crews plan to begin work at the next bridge site, approximately 1 mile southeast of West Blacktail Road (mile marker 239, Bridge ID 5499), starting July 14, weather and unforeseen factors permitting.
Thank you for slowing down and driving carefully through the work zone. Your attention and caution help keep everyone safe.
June 30, 2025
There will be no active construction work on the Timber Bridges – Forsyth Area project this week, in observance of the 4th of July.
Gravel and/or pulverized material now cover all three bridge sites currently under construction. The posted speed limit is reduced to 35 mph through each location. Please drive cautiously and watch for uneven surfaces.
At the drainage bridge just west of Ingomar (mile marker 229, Bridge ID 5496) and the structure near mile marker 236 (Bridge ID 5497), traffic is traveling over the new structures on gravel.
At the third location, just east of Swanson Lane (mile marker 257, Bridge ID 5508), initial roadway work has begun. Crews have partially installed the new structure and will resume work at this location after the holiday.
Thank you for slowing down and driving carefully through the work zone. Your attention and caution help keep everyone safe.
June 23, 2025
Work continues on the Timber Bridges – Forsyth Area project along U.S. Highway 12. At the drainage bridge just west of Ingomar, near mile marker 229 (Bridge ID 5496), traffic is now traveling over the new structure on a gravel surface. Please drive cautiously. The posted speed limit over the gravel is 35 mph.
At the drainage bridge about 2 miles northwest of West Blacktail Road, near mile marker 236 (Bridge ID 5497), crews have completed installation of the concrete box culvert. Crews are now focused on slope work, placing gravel over the new structure, and general site cleanup. Drivers should continue to travel cautiously through the area, where a temporary detour remains in place, and speeds are reduced to 35 mph.
Crews are also preparing to begin work at the next bridge site, the drainage bridge about 90 yards east of Swanson Lane, at mile marker 257 (Bridge ID 5508). Starting this week, crews will begin trench excavation and foundation placement for the new concrete box culvert at this location. As construction ramps up, drivers can expect activity and traffic control in this area.
Thank you for slowing down and driving carefully through the work zone. Your attention and caution help keep everyone safe.
June 16, 2025
Work continues at both active bridge replacement sites along U.S. Highway 12.
At the drainage bridge just west of Ingomar (Bridge ID 5496, near mile marker 229), traffic is now traveling over the new structure on a gravel surface. Crews are completing site cleanup, slope shaping, and shoulder work off the roadway. Please drive cautiously. The posted speed limit over the gravel is 35 mph.
At the drainage bridge about 2 miles northwest of West Blacktail Road (Bridge ID 5497, near mile marker 236), crews are installing the remaining sections of the new concrete box culvert. A temporary detour is in place, and speed is reduced to 35 mph through the detour area.
Crews are scheduled to work on Saturday next week, weather and unforeseen circumstances permitting.
Thank you for slowing down and keeping everyone safe in the work zone.
June 9, 2025
This week, work continues on the Timber Bridges – Forsyth Area project. On the drainage structure just west of Ingomar (Bridge ID 5496) at mile marker 229, crews recently finished placing backfill around the new box culvert. This week, they will finish shoulder work and site clean-up. A shoofly detour with reduced speeds remains in place to guide traffic safely around the site.
At the drainage bridge about 2 miles northwest of West Blacktail Road (Bridge ID 5497, mile marker 236), crews are backfilling around the first section of the new culvert. Next, they will build the temporary detour over the new section to install the remaining culvert pieces, mirroring the process west of Ingomar.
Thank you for driving cautiously and helping keep the area safe for workers and travelers.
June 2, 2025
On the Timber Bridges – Forsyth Area project this week, crews are finishing backfilling around the new box culvert just west of Ingomar on U.S. Highway 12 (Bridge ID 5496), at mile marker 229. A shoofly detour with reduced speeds remains in place to guide traffic safely around the work zone.
Crews are also digging the trench and preparing to place culvert pieces at the drainage bridge 2 miles northwest of West Blacktail Road (Bridge ID 5497), at mile marker 236. Installation of the new culvert at this site is expected to begin late this week.
No traffic control is currently in place near West Blacktail Road, but please drive carefully and remain alert for equipment entering or exiting the area.
Thank you for driving with caution and helping keep the work zone safe for everyone.
May 27, 2025
This week, crews will continue working on the drainage bridge just west of Ingomar (Bridge ID 5496), at mile marker 229 on U.S. Highway 12. They will install additional box culvert sections and backfill around them at this site. Backfilling consists of putting soil around the new sections to support them and help them stay in place.
A shoofly detour remains in place to guide traffic safely around the work zone. The new box culvert at this location is partially installed, and work this week focuses on completing the installation.
In addition to ongoing work at Bridge 5496, crews will continue off-road preparation at the drainage ditch 2 miles northwest of West Blacktail Road (Bridge ID 5497), at mile marker 236.
These are the only active sites in the project area at this time.
Please reduce your speed, follow signage, and remain alert when traveling through the area. Your patience helps ensure a safe work zone for everyone.
May 19, 2025
This week, crews will remove the existing bridge structure at Bridge ID 5496, located just west of Ingomar at mile marker 229. A shoofly detour is now in place to keep traffic moving safely around the work zone.
A new box culvert at this location is partially in place, which is part of the Montana Department of Transportation's (MDT) plan for bridge construction to proceed in stages, with the current detour in place over the new structure. This method avoids fully removing the roadway at once, helping minimize disruption for drivers. Temporary detours will be used as needed, rather than a permanent closure.
This is the only active work site in the project area at this time.
Please slow down, follow signage, and use the temporary detours.
To accommodate holiday traffic over Memorial Day weekend, no work will occur from Friday afternoon, May 23, through Monday, May 26. Normal work hours will resume Tuesday, May 27.
May 12, 2025
This week, on the Timber Bridges – Forsyth Area project, box culvert installation work continues on the drainage ditch just west of Ingomar (Bridge ID 5496) at mile marker 229. Crews are "back-filling" around the new concrete culvert, meaning they are putting soil back around the structure to support it and help it stay in place.
Crews are also continuing site preparation for future culvert installation at the drainage ditch 2 miles northwest of West Blacktail Road (Bridge ID 5497), at mile marker 236.
Please slow down, follow signage, and use the temporary detours.
May 5, 2025
Work is progressing on the Timber Bridges – Forsyth Area project.
This week, now that crews have built a temporary detour, box culvert installation has begun on the drainage ditch just west of Ingomar (Bridge ID 5496) at mile marker 229.
Crews are also continuing site preparation for future culvert installation at the drainage ditch 2 miles northwest of West Blacktail Road (Bridge ID 5497) at mile marker 236 and at the stockpass 90 yards east of Swanson Lane (Bridge ID 5508) at mile marker 257.
Please continue to drive cautiously in the area, follow posted speed limits, and watch for construction crews and equipment. We appreciate your patience as work continues!
April 28, 2025
Work is progressing on the Timber Bridges - Forsyth Area project. This week, now that crews have built a temporary detour, work will begin on the removal of the old bridge structure on the drainage ditch just west of Ingomar (Bridge ID 5496) at mile marker 229.
Crews will also be prepping the road for construction at the drainage ditch 2 miles northwest of West Blacktail Road (Bridge ID 5497) at mile marker 236 and at the stockpass 90 yards east of Swanson Lane (Bridge ID 5508) at mile marker 257. This includes pulverizing and regrading the areas connecting to the bridges so they are ready when full work begins.
Please continue to drive cautiously in the area, follow posted speed limits, and watch for construction signage and equipment. We appreciate your patience as work continues!
April 21, 2025
Construction on the Timber Bridges - Forsyth Area project will start on April 21. Crews will begin work on the drainage ditch just west of Ingomar (Bridge ID 5496) at mile marker 229. Signage will be posted throughout the area to help guide drivers safely through the work zone.
Travelers can expect:
- Temporary detours (shoofly routes), which will maintain traffic flow at select locations; these routes will be clearly marked
- Alternating single-lane closures with flaggers or traffic signals
- Short-term width restrictions (16 feet standard; occasional 12-foot restrictions for up to 5 days with advance notice)
- Continued access to emergency vehicles, school buses, and agricultural equipment
Please watch for signs, follow posted speeds, and allow extra time when traveling through the area.
National Work Zone Awareness Week
April 21-25, 2025 | nwzaw.org
Respect the zone, so we all get home.
In 2023, 282 work zone crashes occurred in Montana. This construction season, MDT urges Montana drivers and visitors to use extra caution while traveling through work zones by paying attention and following posted signage.
Our families thank you.