IRR BIA RTE 56 over Main Drain
PoorPosted for loadLa Paz County, Arizona · 1.7 KM West of BIA 1 · Structure no. 00000000000H034
- Built
- 1968
- 57 years old
- Condition
- Poor
- inspected December 2021
- Type
- Stringer/Multi-beam or Girder
- Concrete
- Length
- 75 ft
- 3 main spans
- Daily traffic
- 165
- 2021 count
- Owner
- Federal
- Bureau of Indian Affairs
About this bridge
IRR BIA RTE 56 over Main Drain is a concrete stringer/multi-beam or girder carrying IRR BIA RTE 56 over Main Drain in La Paz County, Arizona. It was built in 1968, so it is 57 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: posted for load restriction.
It carries about 165 vehicles a day, roughly 15% of them trucks, projected to reach 193 by 2039. The structure is 75 ft (22.9 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 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 56 over Main Drain built?
It was built in 1968, making it 57 years old in 2025.
What condition is IRR BIA RTE 56 over Main Drain 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 December 2021.
How much traffic does IRR BIA RTE 56 over Main Drain carry?
About 165 vehicles per day (2021 count), of which roughly 15% are trucks.
How long is IRR BIA RTE 56 over Main Drain?
The structure is 75 ft (22.9 m) long with a longest span of 25 ft (7.6 m) and a deck 27 ft wide.
Who owns IRR BIA RTE 56 over Main Drain?
It is owned by the Bureau of Indian Affairs.