IRR/NM-74 over Chama River
GoodRio Arriba County, New Mexico · 0.76 MI N of JCT US84/285 · Structure no. 000000000006271
- Built
- 1962
- 63 years old, rebuilt 2005
- Condition
- Good
- inspected December 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 251 ft
- 3 main spans
- Daily traffic
- 2,479
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
IRR/NM-74 over Chama River is a steel continuous stringer/multi-beam or girder carrying IRR/NM-74 over Chama River in Rio Arriba County, New Mexico. It was built in 1962 and reconstructed in 2005, so it is 63 years old, older than the New Mexico average of 51.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 2,479 vehicles a day, roughly 5% of them trucks, projected to reach 3,371 by 2043. The structure is 251 ft (76.6 m) long and 31 ft wide. If it were closed, the detour would be 6.8 mi (11 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR/NM-74 over Chama River built?
It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2005.
What condition is IRR/NM-74 over Chama River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2023.
How much traffic does IRR/NM-74 over Chama River carry?
About 2,479 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is IRR/NM-74 over Chama River?
The structure is 251 ft (76.6 m) long with a longest span of 97 ft (29.6 m) and a deck 31 ft wide.
Who owns IRR/NM-74 over Chama River?
It is owned by the State Highway Agency.