US Bridges

NM-304 over Abo Arroyo

Fair

Socorro County, New Mexico · 7.5 M N JCT US-60/NM-304 · Structure no. 000000000009635

Built
2015
10 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
178 ft
3 main spans
Daily traffic
2,104
2023 count
Owner
State
State Highway Agency

About this bridge

NM-304 over Abo Arroyo is a prestressed concrete continuous stringer/multi-beam or girder carrying NM-304 over Abo Arroyo in Socorro County, New Mexico. It was built in 2015, so it is 10 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 2,104 vehicles a day, roughly 11% of them trucks, projected to reach 2,861 by 2043. The structure is 178 ft (54.4 m) long and 39 ft wide.

Location

Open in Google Maps
CarriesNM-304
CrossesAbo Arroyo
Location7.5 M N JCT US-60/NM-304
RouteState Highway 304
CountySocorro County
StateNew Mexico
Coordinates34.52575, -106.76366
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating70.2 US tons
Inventory rating41.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length178 ft (54.4 m)
Longest span75 ft (22.9 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (10.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,104 (2023)
Projected traffic2,861 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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-304 over Abo Arroyo built?

It was built in 2015, making it 10 years old in 2025.

What condition is NM-304 over Abo Arroyo 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 NM-304 over Abo Arroyo carry?

About 2,104 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-304 over Abo Arroyo?

The structure is 178 ft (54.4 m) long with a longest span of 75 ft (22.9 m) and a deck 39 ft wide.

Who owns NM-304 over Abo Arroyo?

It is owned by the State Highway Agency.