US 87 over Otter Creek
PoorCascade County, Montana · 7M SE Belt · Structure no. P00057003+06121
- Built
- 1959
- 66 years old
- Condition
- Poor
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 103 ft
- 2 main spans
- Daily traffic
- 2,314
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 87 over Otter Creek is a prestressed concrete stringer/multi-beam or girder carrying US 87 over Otter Creek in Cascade County, Montana. It was built in 1959, so it is 66 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 2,314 vehicles a day, roughly 15% of them trucks, projected to reach 2,430 by 2043. The structure is 103 ft (31.4 m) long and 32 ft wide. If it were closed, the detour would be 29.8 mi (48 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 87 over Otter Creek built?
It was built in 1959, making it 66 years old in 2025.
What condition is US 87 over Otter Creek in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.
How much traffic does US 87 over Otter Creek carry?
About 2,314 vehicles per day (2023 count), of which roughly 15% are trucks.
How long is US 87 over Otter Creek?
The structure is 103 ft (31.4 m) long with a longest span of 51 ft (15.5 m) and a deck 32 ft wide.
Who owns US 87 over Otter Creek?
It is owned by the State Highway Agency.