Irr Bia Rte 78 over Chamisa Wash
Sandoval County, New Mexico · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte 78 over Chamisa Wash in Sandoval County, New Mexico, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1997, making it 28 years old at the 2025 inventory.
- It carries about 150 vehicles a day (traffic count year 2023).
- It is one of 62 of the 180 inventoried bridges in Sandoval County rated good (34.4%); 8 (4.4%) 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 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 → (35.5058, -106.7177)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous concrete stringer or multi-beam girder |
| Length | about 163 ft |
| Location | East Edge of Zia Pueblo |
| NBI structure number | 00000000000M140 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2023 |
| Inspection interval (item 91) | 24 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.