US Bridges

NM-178 over I-25 Nbl and Sbl

Good

Socorro County, New Mexico · JCT of I-25 and NM-178 · Structure no. 000000000006754

Built
1967
58 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
189 ft
4 main spans
Daily traffic
224
2023 count
Owner
State
State Highway Agency

About this bridge

NM-178 over I-25 Nbl and Sbl is a prestressed concrete stringer/multi-beam or girder carrying NM-178 over I-25 Nbl and Sbl in Socorro County, New Mexico. It was built in 1967, so it is 58 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 224 vehicles a day, projected to reach 304 by 2043. The structure is 189 ft (57.6 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNM-178
CrossesI-25 Nbl and Sbl
LocationJCT of I-25 and NM-178
RouteState Highway 178
Coordinates33.73704, -107.01224
Functional classRural Local

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.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating31 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length189 ft (57.6 m)
Longest span52 ft (15.8 m)
Deck width34 ft (10.4 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic224 (2023)
Projected traffic304 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$3 million (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-178 over I-25 Nbl and Sbl built?

It was built in 1967, making it 58 years old in 2025.

What condition is NM-178 over I-25 Nbl and Sbl 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 March 2023.

How much traffic does NM-178 over I-25 Nbl and Sbl carry?

About 224 vehicles per day (2023 count).

How long is NM-178 over I-25 Nbl and Sbl?

The structure is 189 ft (57.6 m) long with a longest span of 52 ft (15.8 m) and a deck 34 ft wide.

Who owns NM-178 over I-25 Nbl and Sbl?

It is owned by the State Highway Agency.