Old HWY 10 W over Conn`s Coulee 021
FairPrairie County, Montana · 3M SW Terry · Structure no. L40004009+01001
- Built
- 1930
- 95 years old, rebuilt 1948
- Condition
- Fair
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 58 ft
- 3 main spans
- Daily traffic
- 507
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Old HWY 10 W over Conn`s Coulee 021 is a wood or timber stringer/multi-beam or girder carrying Old HWY 10 W over Conn`s Coulee 021 in Prairie County, Montana. It was built in 1930 and reconstructed in 1948, so it is 95 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 507 vehicles a day, roughly 3% of them trucks, projected to reach 540 by 2043. The structure is 58 ft (17.6 m) long and 32 ft wide. If it were closed, the detour would be 28 mi (45 km).
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old HWY 10 W over Conn`s Coulee 021 built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1948.
What condition is Old HWY 10 W over Conn`s Coulee 021 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 October 2024.
How much traffic does Old HWY 10 W over Conn`s Coulee 021 carry?
About 507 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is Old HWY 10 W over Conn`s Coulee 021?
The structure is 58 ft (17.6 m) long with a longest span of 19 ft (5.8 m) and a deck 32 ft wide.
Who owns Old HWY 10 W over Conn`s Coulee 021?
It is owned by the State Highway Agency.