IRR BIA RTE 12 over Mission Dam Creek
GoodLake County, Montana · 3.2KM E of ST Ignatius Mt · Structure no. 00000000000P852
- Built
- 2010
- 15 years old
- Condition
- Good
- inspected June 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 57 ft
- 1 main span
- Daily traffic
- 30
- 2023 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 12 over Mission Dam Creek is a prestressed concrete tee beam carrying IRR BIA RTE 12 over Mission Dam Creek in Lake County, Montana. It was built in 2010, so it is 15 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 45 by 2043. The structure is 57 ft (17.3 m) long and 18 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE 12 over Mission Dam Creek built?
It was built in 2010, making it 15 years old in 2025.
What condition is IRR BIA RTE 12 over Mission Dam Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.
How much traffic does IRR BIA RTE 12 over Mission Dam Creek carry?
About 30 vehicles per day (2023 count), of which roughly 10% are trucks.
How long is IRR BIA RTE 12 over Mission Dam Creek?
The structure is 57 ft (17.3 m) long with a longest span of 53 ft (16.3 m) and a deck 18 ft wide.
Who owns IRR BIA RTE 12 over Mission Dam Creek?
It is owned by the Bureau of Indian Affairs.