Nm-406 over North Canadian River
Union County, New Mexico · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Nm-406 over North Canadian River in Union County, New Mexico, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1977, making it 48 years old at the 2025 inventory.
- It carries about 169 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 30 of the 68 inventoried bridges in Union County rated fair (44.1%); 1 (1.5%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated January 2025, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (36.70131, -103.07076)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous prestressed concrete stringer or multi-beam girder |
| Length | about 201 ft |
| Location | 19.2 Mi N of Jct US-56/64 |
| NBI structure number | 000000000007648 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | January 2025 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the New Mexico department of transportation.
Busiest bridges in Union County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-87 over Unnamed Waterway | 1961 | 6,226 | Good |
| US-87 over Unnamed Waterway | 1961 | 6,226 | Good |
| US-64 over Unnamed Waterway | 1937 | 5,229 | Good |
| US-64 over Unnamed Waterway | 1937 | 5,229 | Good |
| US-64 over Unnamed Waterway | 1937 | 5,229 | Fair |
| US-64/87 Ebl/wbl over Unnamed Waterway | 1959 | 4,234 | Good |
All bridges nearby: Union County, NM bridge conditions · every bridge in Union County · New Mexico bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.