Old HWY 312 over Seven Mile Creek 168
FairYellowstone County, Montana · 5M SW Huntley · Structure no. L56788006+05001
- Built
- 1947
- 78 years old
- Condition
- Fair
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 26 ft
- 1 main span
- Daily traffic
- 7,544
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Old HWY 312 over Seven Mile Creek 168 is a wood or timber stringer/multi-beam or girder carrying Old HWY 312 over Seven Mile Creek 168 in Yellowstone County, Montana. It was built in 1947, so it is 78 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 5 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 7,544 vehicles a day, roughly 1% of them trucks, projected to reach 7,921 by 2043. The structure is 26 ft (7.9 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Old HWY 312 over Seven Mile Creek 168 built?
It was built in 1947, making it 78 years old in 2025.
What condition is Old HWY 312 over Seven Mile Creek 168 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 312 over Seven Mile Creek 168 carry?
About 7,544 vehicles per day (2023 count), of which roughly 1% are trucks.
How long is Old HWY 312 over Seven Mile Creek 168?
The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 32 ft wide.
Who owns Old HWY 312 over Seven Mile Creek 168?
It is owned by the State Highway Agency.