Irr/nm-4 over Unnamed Waterway
Sandoval County, New Mexico · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr/nm-4 over Unnamed Waterway in Sandoval 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 1986, making it 39 years old at the 2025 inventory.
- It carries about 2,114 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 110 of the 180 inventoried bridges in Sandoval County rated fair (61.1%); 8 (4.4%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated good in the 2024 inventory and is now fair (culvert 7 to 6).
- Its most recent inspection on record is dated August 2024, on a 48-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 → (35.65208, -106.7321)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 7 | 6 | Satisfactory condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 42 ft |
| Location | 8.2 Mi N of Nm-550 |
| NBI structure number | 000000000008493 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 48 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the New Mexico department of transportation.
Busiest bridges in Sandoval County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-550 over Irrigation Ditch | 1938 | 91,260 | Good |
| US-550 Sbl over Rio Grande River | 1986 | 91,260 | Fair |
| US-550 Sbl over Rio Grande | 1986 | 91,260 | Fair |
| I-25 Nbl/sbl over Unnamed Waterway | 1954 | 70,705 | Fair |
| I-25 NBL and SBL over Sandia wash | 2011 | 70,705 | Fair |
| I-25 Nbl/sbl over Unnamed Waterway | 1954 | 59,841 | Fair |
All bridges nearby: Sandoval County, NM bridge conditions · every bridge in Sandoval County · New Mexico bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.