Nm-4 over Unnamed Waterway
Los Alamos County, New Mexico · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Nm-4 over Unnamed Waterway in Los Alamos 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 1954, making it 71 years old at the 2025 inventory.
- It carries about 1,036 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 1 of the 3 inventoried bridges in Los Alamos County rated good (33.3%); 0 (0.0%) 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 → (35.8128, -106.23248)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 34 ft |
| Location | Nm 4 Mm 61.6 |
| NBI structure number | 000000000005693 |
| Condition class | Good |
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 |
|---|---|---|---|
| NM501 over Omega Road West Road | 1951 | 8,118 | Fair |
| 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.