US Bridges

NM-74 over Rio Grande

Fair

Rio Arriba County, New Mexico · 2.8 MI E of US-84/US-285 · Structure no. 000000000008947

Built
1997
28 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
808 ft
6 main spans
Daily traffic
5,075
2023 count
Owner
State
State Highway Agency

About this bridge

NM-74 over Rio Grande is a prestressed concrete continuous stringer/multi-beam or girder carrying NM-74 over Rio Grande in Rio Arriba County, New Mexico. It was built in 1997, so it is 28 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 5,075 vehicles a day, roughly 5% of them trucks, projected to reach 6,902 by 2043. The structure is 808 ft (246.3 m) long and 43 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesNM-74
CrossesRio Grande
Location2.8 MI E of US-84/US-285
RouteState Highway 74
CountyRio Arriba County
StateNew Mexico
Coordinates36.05786, -106.08189
Functional classUrban Minor Arterial

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length808 ft (246.3 m)
Longest span135 ft (41.1 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,075 (2023)
Projected traffic6,902 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-74 over Rio Grande built?

It was built in 1997, making it 28 years old in 2025.

What condition is NM-74 over Rio Grande 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 April 2024.

How much traffic does NM-74 over Rio Grande carry?

About 5,075 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is NM-74 over Rio Grande?

The structure is 808 ft (246.3 m) long with a longest span of 135 ft (41.1 m) and a deck 43 ft wide.

Who owns NM-74 over Rio Grande?

It is owned by the State Highway Agency.