NM501 over Omega Road West Road
Los Alamos County, New Mexico · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- NM501 over Omega Road West Road in Los Alamos County, New Mexico, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1951 and reconstructed in 1992, making it 74 years old at the 2025 inventory.
- It carries about 8,118 vehicles a day (traffic count year 2022).
- It is one of 2 of the 3 inventoried bridges in Los Alamos County rated fair (66.7%); 0 (0.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated poor in the 2024 inventory and is now fair (deck 5 to 6, superstructure 5 to 6, substructure 4 to 5).
- Its most recent inspection on record is dated June 2024, on a 24-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (35.88, -106.32194)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 6 | Satisfactory condition |
| Superstructure | 5 | 6 | Satisfactory condition |
| Substructure | 4 | 5 | Fair condition |
Bridge details
| Structure | Steel deck arch |
| Length | about 819 ft |
| Location | JCT.NM501 and Omega Road |
| NBI structure number | 000000000007622 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 9: foundations on dry land well above flood elevations |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the New Mexico department of transportation.
Busiest bridges in Los Alamos County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Nm-4 over Unnamed Waterway | 1954 | 1,036 | Good |
| Canyon Glen Rd over Glen Canyon | 1999 | 477 | Fair |
All bridges nearby: Los Alamos County, NM bridge conditions · every bridge in Los Alamos County · New Mexico bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.