US Bridges

NM-371 over Chaco River

Good

San Juan County, New Mexico · 56.0 MI N of JCT I-40 · Structure no. 000000000007465

Built
1979
46 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
393 ft
5 main spans
Daily traffic
2,653
2023 count
Owner
State
State Highway Agency

About this bridge

NM-371 over Chaco River is a prestressed concrete stringer/multi-beam or girder carrying NM-371 over Chaco River in San Juan County, New Mexico. It was built in 1979, so it is 46 years old, younger 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 2,653 vehicles a day, roughly 11% of them trucks, projected to reach 3,608 by 2043. The structure is 393 ft (119.9 m) long and 51 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesNM-371
CrossesChaco River
Location56.0 MI N of JCT I-40
RouteState Highway 371
Coordinates36.1141, -108.19103
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating32.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length393 ft (119.9 m)
Longest span78 ft (23.8 m)
Deck width51 ft (15.5 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,653 (2023)
Projected traffic3,608 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.4 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was NM-371 over Chaco River built?

It was built in 1979, making it 46 years old in 2025.

What condition is NM-371 over Chaco 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 September 2023.

How much traffic does NM-371 over Chaco River carry?

About 2,653 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-371 over Chaco River?

The structure is 393 ft (119.9 m) long with a longest span of 78 ft (23.8 m) and a deck 51 ft wide.

Who owns NM-371 over Chaco River?

It is owned by the State Highway Agency.