IRR - US 89 over Agency Creek
FairGlacier County, Montana · 15M SE Browning · Structure no. P00003096+01891
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 71 ft
- 1 main span
- Daily traffic
- 1,266
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR - US 89 over Agency Creek is a prestressed concrete stringer/multi-beam or girder carrying IRR - US 89 over Agency Creek in Glacier County, Montana. It was built in 1966, so it is 59 years old, older 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 1,266 vehicles a day, roughly 4% of them trucks, projected to reach 1,329 by 2043. The structure is 71 ft (21.6 m) long and 37 ft wide. If it were closed, the detour would be 72.7 mi (117 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 IRR - US 89 over Agency Creek built?
It was built in 1966, making it 59 years old in 2025.
What condition is IRR - US 89 over Agency Creek 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 September 2023.
How much traffic does IRR - US 89 over Agency Creek carry?
About 1,266 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is IRR - US 89 over Agency Creek?
The structure is 71 ft (21.6 m) long with a longest span of 70 ft (21.3 m) and a deck 37 ft wide.
Who owns IRR - US 89 over Agency Creek?
It is owned by the State Highway Agency.