US 12 over Drainage
PoorRosebud County, Montana · 4M E Sumatra · Structure no. P00014224+06031
- Built
- 1947
- 78 years old
- Condition
- Poor
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 58 ft
- 3 main spans
- Daily traffic
- 222
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 12 over Drainage is a wood or timber stringer/multi-beam or girder carrying US 12 over Drainage in Rosebud 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 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 222 vehicles a day, roughly 14% of them trucks, projected to reach 233 by 2043. The structure is 58 ft (17.7 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 12 over Drainage built?
It was built in 1947, making it 78 years old in 2025.
What condition is US 12 over Drainage 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 September 2024.
How much traffic does US 12 over Drainage carry?
About 222 vehicles per day (2023 count), of which roughly 14% are trucks.
How long is US 12 over Drainage?
The structure is 58 ft (17.7 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.
Who owns US 12 over Drainage?
It is owned by the State Highway Agency.