I 15 over RR
GoodLewis and Clark County, Montana · 2M N Craig · Structure no. I00015235+09781
- Built
- 1967
- 58 years old
- Condition
- Good
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 366 ft
- 7 main spans
- Daily traffic
- 2,201
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over RR is a prestressed concrete stringer/multi-beam or girder carrying I 15 over RR in Lewis and Clark County, Montana. It was built in 1967, so it is 58 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 2,201 vehicles a day, roughly 16% of them trucks, projected to reach 2,343 by 2043. The structure is 366 ft (111.5 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over RR built?
It was built in 1967, making it 58 years old in 2025.
What condition is I 15 over RR in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.
How much traffic does I 15 over RR carry?
About 2,201 vehicles per day (2023 count), of which roughly 16% are trucks.
How long is I 15 over RR?
The structure is 366 ft (111.5 m) long with a longest span of 82 ft (24.9 m) and a deck 33 ft wide.
Who owns I 15 over RR?
It is owned by the State Highway Agency.