IRR/US64/491 Wbl over San Juan River
San Juan County, New Mexico · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- IRR/US64/491 Wbl over San Juan River in San Juan County, New Mexico, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- It was built in 1936, making it 89 years old at the 2025 inventory.
- It carries about 16,829 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (36.78122, -108.69206)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 3 | Serious condition |
| Superstructure | 4 | Poor condition |
| Substructure | 4 | Poor condition |
Bridge details
| Structure | Steel through truss |
| Length | about 1,004 ft |
| Location | US-491/US-64 in Shiprock |
| NBI structure number | 000000000001792 |
Source: FHWA National Bridge Inventory, 2025 data as reported by the New Mexico department of transportation.
All bridges nearby: San Juan County, NM bridge conditions · New Mexico bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.