I 15 over Int Rocker
FairSilver Bow County, Montana · Rocker · Structure no. I00015122+04231
- Built
- 1968
- 57 years old
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 118 ft
- 3 main spans
- Daily traffic
- 10,824
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I 15 over Int Rocker is a prestressed concrete stringer/multi-beam or girder carrying I 15 over Int Rocker in Silver Bow County, Montana. It was built in 1968, so it is 57 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 10,824 vehicles a day, roughly 10% of them trucks, projected to reach 11,365 by 2043. The structure is 118 ft (36 m) long and 41 ft wide.
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I 15 over Int Rocker built?
It was built in 1968, making it 57 years old in 2025.
What condition is I 15 over Int Rocker in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2023.
How much traffic does I 15 over Int Rocker carry?
About 10,824 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is I 15 over Int Rocker?
The structure is 118 ft (36 m) long with a longest span of 45 ft (13.7 m) and a deck 41 ft wide.
Who owns I 15 over Int Rocker?
It is owned by the State Highway Agency.