Irr/nm-399 over Arroyo De La Mesilla
Rio Arriba County, New Mexico · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr/nm-399 over Arroyo De La Mesilla in Rio Arriba County, New Mexico, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 1979, making it 46 years old at the 2025 inventory.
- It carries about 3,198 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 61 of the 159 inventoried bridges in Rio Arriba County rated good (38.4%); 10 (6.3%) are rated poor.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (35.95071, -106.07049)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Steel culvert |
| Length | about 38 ft |
| Location | 2.55 Mi SW of Jct US-84 |
| NBI structure number | 000000000008309 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the New Mexico department of transportation.
Busiest bridges in Rio Arriba County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Nm-68 NB over Santa Cruz River | 1957 | 19,160 | Poor |
| Nm-68 SB over Santa Cruz River | 1957 | 19,160 | Fair |
| Nm-584 over Rio Grande | 1977 | 17,171 | Fair |
| Nm-68 over Unnamed Waterway | 1956 | 16,476 | Fair |
| Nm-68 over Unnamed Waterway | 1925 | 16,131 | Good |
| Nm-68 SB over Unnamed Waterway | 1956 | 16,131 | Good |
All bridges nearby: Rio Arriba County, NM bridge conditions · every bridge in Rio Arriba County · New Mexico bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.