IRR BIA RTE 31 over Southern Pacific RR
PoorYuma County, Arizona · In Fort Yuma Sub-Agency · Structure no. 00000000000H050
- Built
- 1965
- 60 years old
- Condition
- Poor
- inspected February 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 118 ft
- 3 main spans
- Daily traffic
- 3,550
- 2024 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 31 over Southern Pacific RR is a steel stringer/multi-beam or girder carrying IRR BIA RTE 31 over Southern Pacific RR in Yuma County, Arizona. It was built in 1965, so it is 60 years old, older than the Arizona average of 47.8 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: open, posting recommended but not legally implemented.
It carries about 3,550 vehicles a day, roughly 10% of them trucks, projected to reach 4,200 by 2044. The structure is 118 ft (35.9 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR BIA RTE 31 over Southern Pacific RR built?
It was built in 1965, making it 60 years old in 2025.
What condition is IRR BIA RTE 31 over Southern Pacific RR 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 February 2024.
How much traffic does IRR BIA RTE 31 over Southern Pacific RR carry?
About 3,550 vehicles per day (2024 count), of which roughly 10% are trucks.
How long is IRR BIA RTE 31 over Southern Pacific RR?
The structure is 118 ft (35.9 m) long with a longest span of 51 ft (15.6 m) and a deck 33 ft wide.
Who owns IRR BIA RTE 31 over Southern Pacific RR?
It is owned by the Bureau of Indian Affairs.