IRR BIA RTE 73 over Big Horn Canal
GoodBig Horn County, Montana · 4.5 KM SE of St. Xavier · Structure no. 00000000000C221
- Built
- 1986
- 39 years old
- Condition
- Good
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 47 ft
- 1 main span
- Daily traffic
- 200
- 2024 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 73 over Big Horn Canal is a prestressed concrete stringer/multi-beam or girder carrying IRR BIA RTE 73 over Big Horn Canal in Big Horn County, Montana. It was built in 1986, so it is 39 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 200 vehicles a day, roughly 20% of them trucks, projected to reach 234 by 2044. The structure is 47 ft (14.4 m) long and 34 ft wide. If it were closed, the detour would be 55.3 mi (89 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE 73 over Big Horn Canal built?
It was built in 1986, making it 39 years old in 2025.
What condition is IRR BIA RTE 73 over Big Horn Canal 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 June 2024.
How much traffic does IRR BIA RTE 73 over Big Horn Canal carry?
About 200 vehicles per day (2024 count), of which roughly 20% are trucks.
How long is IRR BIA RTE 73 over Big Horn Canal?
The structure is 47 ft (14.4 m) long with a longest span of 45 ft (13.7 m) and a deck 34 ft wide.
Who owns IRR BIA RTE 73 over Big Horn Canal?
It is owned by the Bureau of Indian Affairs.