US Bridges

39-0379 over Largo Canyon

Fair

Rio Arriba County, New Mexico · 26.4 MI S of US 64/BLANCO · Structure no. 000000000008556

Built
1985
40 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
210 ft
3 main spans
Daily traffic
166
2023 count
Owner
County
County Highway Agency

About this bridge

39-0379 over Largo Canyon is a prestressed concrete continuous stringer/multi-beam or girder carrying 39-0379 over Largo Canyon in Rio Arriba County, New Mexico. It was built in 1985, so it is 40 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 166 vehicles a day, projected to reach 225 by 2043. The structure is 210 ft (64 m) long and 30 ft wide. If it were closed, the detour would be 26.7 mi (43 km).

Location

Open in Google Maps
Carries39-0379
CrossesLargo Canyon
Location26.4 MI S of US 64/BLANCO
RouteCounty Highway 39379
CountyRio Arriba County
StateNew Mexico
Coordinates36.48149, -107.5267
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.4 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length210 ft (64 m)
Longest span69 ft (21 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic166 (2023)
Projected traffic225 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.7 mi (43 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 39-0379 over Largo Canyon built?

It was built in 1985, making it 40 years old in 2025.

What condition is 39-0379 over Largo Canyon in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2024.

How much traffic does 39-0379 over Largo Canyon carry?

About 166 vehicles per day (2023 count).

How long is 39-0379 over Largo Canyon?

The structure is 210 ft (64 m) long with a longest span of 69 ft (21 m) and a deck 30 ft wide.

Who owns 39-0379 over Largo Canyon?

It is owned by the County Highway Agency.