US Bridges

NM-423 over I-25 Nbl/Sbl

Fair

Bernalillo County, New Mexico · 6.1 M.N. JCT I-25/I-40 · Structure no. 000000000008535

Built
1986
39 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
199 ft
2 main spans
Daily traffic
52,405
2023 count
Owner
State
State Highway Agency

About this bridge

NM-423 over I-25 Nbl/Sbl is a prestressed concrete continuous stringer/multi-beam or girder carrying NM-423 over I-25 Nbl/Sbl in Bernalillo County, New Mexico. It was built in 1986, so it is 39 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 5 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 52,405 vehicles a day, roughly 12% of them trucks, projected to reach 71,270 by 2043. The structure is 199 ft (60.8 m) long and 114 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNM-423
CrossesI-25 Nbl/Sbl
Location6.1 M.N. JCT I-25/I-40
RouteState Highway 423
CountyBernalillo County
StateNew Mexico
Coordinates35.17422, -106.58388
Functional classUrban Other Principal 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.8 US tons
Inventory rating31.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length199 ft (60.8 m)
Longest span97 ft (29.6 m)
Deck width114 ft (34.8 m)
Roadway width114 ft (34.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52,405 (2023)
Projected traffic71,270 by 2043
Trucks12%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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-423 over I-25 Nbl/Sbl built?

It was built in 1986, making it 39 years old in 2025.

What condition is NM-423 over I-25 Nbl/Sbl 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-423 over I-25 Nbl/Sbl carry?

About 52,405 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is NM-423 over I-25 Nbl/Sbl?

The structure is 199 ft (60.8 m) long with a longest span of 97 ft (29.6 m) and a deck 114 ft wide.

Who owns NM-423 over I-25 Nbl/Sbl?

It is owned by the State Highway Agency.