Irr Bia Rte N321 over Crystal Creek
San Juan County, New Mexico · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte N321 over Crystal Creek in San Juan County, New Mexico, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 2 (critical condition) on the 0-9 scale.
- It was built in 1940, making it 85 years old at the 2025 inventory.
- It carries about 254 vehicles a day (traffic count year 2023).
- It is one of 10 of the 174 inventoried bridges in San Juan County rated poor (5.7%); 10 (5.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, posting recommended but not legally implemented (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated March 2023, on a 12-month routine inspection cycle.
- 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 → (36.04372, -108.96733)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 2 | 2 | Critical condition |
| Substructure | 2 | 2 | Critical condition |
Bridge details
| Structure | Timber stringer or multi-beam girder |
| Length | about 85 ft |
| Location | In Crystal New Mexico |
| NBI structure number | 00000000000N616 |
| Condition class | Poor |
| Traffic status (item 41) | Open, posting recommended but not legally implemented |
| Last inspection (item 90) | March 2023 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the New Mexico department of transportation.
Busiest bridges in San Juan County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Nm-516 over Unnamed Waterway | 1937 | 37,626 | Fair |
| Nm-516 over Unnamed Waterway | 1937 | 29,593 | Fair |
| Nm-516 over Unnamed Waterway | 1937 | 22,275 | Fair |
| Nm-516 over Unnamed Waterway | 1937 | 22,275 | Fair |
| Nm-516 over Unnamed Waterway | 1937 | 22,275 | Fair |
| US-64 Ebl/wbl over Unnamed Waterway | 1964 | 21,685 | Good |
All bridges nearby: San Juan County, NM bridge conditions · every bridge in San Juan County · New Mexico bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.