IRR - S 28 over Little Bitterroot River
FairSanders County, Montana · 1M N Lonepine · Structure no. P00036026+07371
- Built
- 2010
- 15 years old
- Condition
- Fair
- inspected February 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 95 ft
- 1 main span
- Daily traffic
- 1,877
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - S 28 over Little Bitterroot River is a prestressed concrete stringer/multi-beam or girder carrying IRR - S 28 over Little Bitterroot River in Sanders 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 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 1,877 vehicles a day, roughly 6% of them trucks, projected to reach 2,037 by 2043. The structure is 95 ft (29 m) long and 38 ft wide. If it were closed, the detour would be 42.9 mi (69 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - S 28 over Little Bitterroot River built?
It was built in 2010, making it 15 years old in 2025.
What condition is IRR - S 28 over Little Bitterroot River 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 February 2025.
How much traffic does IRR - S 28 over Little Bitterroot River carry?
About 1,877 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is IRR - S 28 over Little Bitterroot River?
The structure is 95 ft (29 m) long with a longest span of 93 ft (28.3 m) and a deck 38 ft wide.
Who owns IRR - S 28 over Little Bitterroot River?
It is owned by the State Highway Agency.