S 89 over Int South Dillon I 15
FairBeaverhead County, Montana · Dillon · Structure no. P00089000+00001
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected February 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 285 ft
- 4 main spans
- Daily traffic
- 1,804
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 89 over Int South Dillon I 15 is a prestressed concrete stringer/multi-beam or girder carrying S 89 over Int South Dillon I 15 in Beaverhead 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 5 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 1,804 vehicles a day, roughly 2% of them trucks, projected to reach 1,939 by 2043. The structure is 285 ft (87 m) long and 50 ft wide.
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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 89 over Int South Dillon I 15 built?
It was built in 1983, making it 42 years old in 2025.
What condition is S 89 over Int South Dillon I 15 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 2024.
How much traffic does S 89 over Int South Dillon I 15 carry?
About 1,804 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is S 89 over Int South Dillon I 15?
The structure is 285 ft (87 m) long with a longest span of 95 ft (29 m) and a deck 50 ft wide.
Who owns S 89 over Int South Dillon I 15?
It is owned by the State Highway Agency.