Nm-104 over Unnamed Waterway
San Miguel County, New Mexico · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Nm-104 over Unnamed Waterway in San Miguel County, New Mexico, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1959, making it 66 years old at the 2025 inventory.
- It carries about 151 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 14 of the 175 inventoried bridges in San Miguel County rated poor (8.0%); 14 (8.0%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Status change: newly posted for load since 2024.
- Its most recent inspection on record is dated February 2025, on a 12-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (35.32909, -104.2267)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 3 | 3 | Serious condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Concrete channel beam |
| Length | about 187 ft |
| Location | 2.0 Mi E of Jct Nm-129 |
| NBI structure number | 000000000005995 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | February 2025 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the New Mexico department of transportation.
Busiest bridges in San Miguel County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Mills AVE. (LV) over Gallinas River | 1998 | 14,679 | Good |
| I-25 Nbl over Agua Sarca Creek | 1973 | 12,084 | Fair |
| I-25 Sbl over Agua Sarca Creek | 1973 | 12,084 | Fair |
| I-25 Nbl/sbl/frntg over Unnamed Waterway | 1966 | 12,084 | Fair |
| I-25 Nbl/sbl over Unnamed Waterway | 1973 | 12,084 | Good |
| I-25 Nbl over I-25 Service Road | 1966 | 10,978 | Fair |
All bridges nearby: San Miguel County, NM bridge conditions · every bridge in San Miguel County · New Mexico bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.