IRR BIA RTE 13 over South Fork Milk River
PoorPosted for loadGlacier County, Montana · 31KM North Blackfeet Schl · Structure no. 00000000000C130
- Built
- 1979
- 46 years old
- Condition
- Poor
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 102 ft
- 4 main spans
- Daily traffic
- 60
- 2023 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 13 over South Fork Milk River is a wood or timber stringer/multi-beam or girder carrying IRR BIA RTE 13 over South Fork Milk River in Glacier County, Montana. It was built in 1979, so it is 46 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.
It carries about 60 vehicles a day, roughly 20% of them trucks, projected to reach 70 by 2043. The structure is 102 ft (31.1 m) long and 26 ft wide. If it were closed, the detour would be 49.7 mi (80 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 13 over South Fork Milk River built?
It was built in 1979, making it 46 years old in 2025.
What condition is IRR BIA RTE 13 over South Fork Milk River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.
How much traffic does IRR BIA RTE 13 over South Fork Milk River carry?
About 60 vehicles per day (2023 count), of which roughly 20% are trucks.
How long is IRR BIA RTE 13 over South Fork Milk River?
The structure is 102 ft (31.1 m) long with a longest span of 25 ft (7.6 m) and a deck 26 ft wide.
Who owns IRR BIA RTE 13 over South Fork Milk River?
It is owned by the Bureau of Indian Affairs.