S 323 over Little Missouri River
FairCarter County, Montana · 15M NE Alzada · Structure no. S00323056+05001
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 142 ft
- 2 main spans
- Daily traffic
- 216
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 323 over Little Missouri River is a prestressed concrete stringer/multi-beam or girder carrying S 323 over Little Missouri River in Carter County, Montana. It was built in 1983, so it is 42 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 216 vehicles a day, roughly 14% of them trucks, projected to reach 254 by 2043. The structure is 142 ft (43.4 m) long and 34 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 323 over Little Missouri River built?
It was built in 1983, making it 42 years old in 2025.
What condition is S 323 over Little Missouri 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 August 2023.
How much traffic does S 323 over Little Missouri River carry?
About 216 vehicles per day (2023 count), of which roughly 14% are trucks.
How long is S 323 over Little Missouri River?
The structure is 142 ft (43.4 m) long with a longest span of 71 ft (21.6 m) and a deck 34 ft wide.
Who owns S 323 over Little Missouri River?
It is owned by the State Highway Agency.