Project Overview
The I 15 Bridge Rehabilitations - Jefferson City and Clancy Area project will repair and rehabilitate 12 bridges in southwestern Montana along I 15 between Helena and Jefferson City. The bridges are aging and in need of repairs and routine upkeep. They are currently safe to drive on, but it is essential to implement the repairs needed to keep them functional and enhance safety features.
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.
Project Map
I 15 Bridge Rehabilitations - Jefferson City and Clancy Area Project Map
Click on the image for a larger view
Why is this project important?
The I 15 Bridge Rehabilitations - Jefferson City and Clancy 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 they inspect, evaluate, replace, rehabilitate, and preserve structures under their authority.
Project Timeline
MDT and Frontier West, Inc. will begin this project in spring 2023 and hope to complete it in 2024, weather and other factors permitting.
Impacts on the Public
During work hours, motorists on I 15 should expect short delays, flaggers and signals controlling the movement of traffic, single-lane restrictions, reduced speed limits, and Interstate crossovers. MDT and Frontier West will maintain traffic flow but rely on you to keep roadway crews safe.
When traveling during construction season, watch for the “cone zone” and workers on the highway. These workers spend their days working a short distance from fast-moving vehicles, and while they make every effort to work safely, they count on you to pay attention, slow down and be careful as you pass through a work zone.
Engineer to English
- Bridge Deck - the flat, drivable surface of a bridge supported by beams, trusses, girders, columns, etc.
- Crack Seal - when products are applied to the road or bridge deck to fill cracks and prevent them from getting water, sand, plants, rocks, etc., in them.
- Deck Joints - places where pieces of the bridge come together; they allow the road to expand and contract during temperature changes without breaking or cracking.
- Rail Revision - modifying the metal or concrete guard rails along the bridge.
- Spalling - when small chunks of concrete break or flake off due to weather or damage.
Bridge List
| MDT Structure ID | Feature Intersected | Location | County |
|---|---|---|---|
| 03221 | Jefferson County Route 926 Bridge over I 15 | 1 mi N of Montana City | JEFFERSON |
| 01175 | I 15 Bridge over Abandoned Railroad NB | 0.6 mi S of Montana City | JEFFERSON |
| 01176 | I 15 Bridge over Abandoned Railroad SB | 0.6 mi S of Montana City | JEFFERSON |
| 01173 | I 15 Bridge over Frontage Road SB | 1.9 mi S of Montana City | JEFFERSON |
| 01172 | I 15 Bridge over Frontage Road NB | 1.9 mi S of Montana City | JEFFERSON |
| 01171 | I 15 Bridge over Lump Gulch Rd SB | 0.6 mi N of Clancy | JEFFERSON |
| 01170 | I 15 Bridge over Lump Gulch Rd NB | 0.6 mi N of Clancy | JEFFERSON |
| 01168 | Clancy Interchange NB | Clancy | JEFFERSON |
| 01169 | Clancy Interchange SB | Clancy | JEFFERSON |
| 01167 | Prickly Pear Creek | 0.6 mi S of Clancy | JEFFERSON |
| 01166 | Prickly Pear Creek | 1.2 mi S of Clancy | JEFFERSON |
| 03220 | Jefferson City Interchange | Jefferson City | JEFFERSON |
UPN 9782000 & 9783000