I 15 over Beaverhead River
GoodBeaverhead County, Montana · 0.6M N Dillon · Structure no. I00015064+00881
- Built
- 1973
- 52 years old
- Condition
- Good
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 143 ft
- 2 main spans
- Daily traffic
- 1,958
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Beaverhead River is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Beaverhead River in Beaverhead County, Montana. It was built in 1973, so it is 52 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 1,958 vehicles a day, roughly 23% of them trucks, projected to reach 2,114 by 2043. The structure is 143 ft (43.6 m) long and 44 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over Beaverhead River built?
It was built in 1973, making it 52 years old in 2025.
What condition is I 15 over Beaverhead River 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 November 2023.
How much traffic does I 15 over Beaverhead River carry?
About 1,958 vehicles per day (2023 count), of which roughly 23% are trucks.
How long is I 15 over Beaverhead River?
The structure is 143 ft (43.6 m) long with a longest span of 70 ft (21.3 m) and a deck 44 ft wide.
Who owns I 15 over Beaverhead River?
It is owned by the State Highway Agency.