IRR/US64/491 Wbl over San Juan River
PoorSan Juan County, New Mexico · US-491/US-64 in Shiprock · Structure no. 000000000001792
- Built
- 1936
- 89 years old
- Condition
- Poor
- inspected February 2024
- Type
- Truss - Thru
- Steel
- Length
- 1,005 ft
- 6 main spans
- Daily traffic
- 16,829
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR/US64/491 Wbl over San Juan River is a steel truss - thru carrying IRR/US64/491 Wbl over San Juan River in San Juan County, New Mexico. It was built in 1936, so it is 89 years old, older than the New Mexico average of 51.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 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.
It carries about 16,829 vehicles a day, roughly 13% of them trucks, projected to reach 22,887 by 2043. The structure is 1,005 ft (306.3 m) long and 35 ft wide. If it were closed, the detour would be 41 mi (66 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, 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/US64/491 Wbl over San Juan River built?
It was built in 1936, making it 89 years old in 2025.
What condition is IRR/US64/491 Wbl over San Juan 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 February 2024.
How much traffic does IRR/US64/491 Wbl over San Juan River carry?
About 16,829 vehicles per day (2023 count), of which roughly 13% are trucks.
How long is IRR/US64/491 Wbl over San Juan River?
The structure is 1,005 ft (306.3 m) long with a longest span of 166 ft (50.6 m) and a deck 35 ft wide.
Who owns IRR/US64/491 Wbl over San Juan River?
It is owned by the State Highway Agency.