SS-11A over Swan River 111
GoodMissoula County, Montana · Lindbergh Lake Road · Structure no. L32654004+04001
- Built
- 1978
- 47 years old
- Condition
- Good
- inspected September 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 83 ft
- 1 main span
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
SS-11A over Swan River 111 is a prestressed concrete tee beam carrying SS-11A over Swan River 111 in Missoula County, Montana. It was built in 1978, so it is 47 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 83 ft (25.3 m) long and 12 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SS-11A over Swan River 111 built?
It was built in 1978, making it 47 years old in 2025.
What condition is SS-11A over Swan River 111 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 September 2023.
How much traffic does SS-11A over Swan River 111 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is SS-11A over Swan River 111?
The structure is 83 ft (25.3 m) long with a longest span of 79 ft (24.1 m) and a deck 12 ft wide.
Who owns SS-11A over Swan River 111?
It is owned by the County Highway Agency.