Irr Bia Rte N543 over Slick Rock Wash
McKinley County, New Mexico · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte N543 over Slick Rock Wash in McKinley County, New Mexico, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1990, making it 35 years old at the 2025 inventory.
- It carries about 531 vehicles a day (traffic count year 2023).
- It is one of 157 of the 289 inventoried bridges in McKinley County rated fair (54.3%); 23 (8.0%) 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 March 2023, on a 24-month routine inspection cycle.
- 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 → (35.72878, -109.03311)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete culvert |
| Length | about 20 ft |
| Location | 0.2 Mi N Pigeon Springs |
| NBI structure number | 00000000000N678 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2023 |
| Inspection interval (item 91) | 24 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 McKinley County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-40 Wbl over BNSF R/R Spur | 1980 | 31,569 | Fair |
| I-40 Ebl over BNSF R/R Spur | 1980 | 31,569 | Fair |
| I-40 Ebl over Third Street | 1980 | 31,569 | Fair |
| I-40 WB over Third Street | 1980 | 31,569 | Fair |
| I-40 WB over Second Street | 1980 | 31,569 | Fair |
| I-40 Ebl over Second Street | 1980 | 31,569 | Fair |
All bridges nearby: McKinley County, NM bridge conditions · every bridge in McKinley County · New Mexico bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.