US Bridges

NM-1 over I-25 Nbl and Sbl

Fair

Socorro County, New Mexico · 9.7 MI N of Sierra Cl · Structure no. 000000000006778

Built
1968
57 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
413 ft
5 main spans
Daily traffic
27
2023 count
Owner
State
State Highway Agency

About this bridge

NM-1 over I-25 Nbl and Sbl is a concrete continuous box beam or girders - single or spread carrying NM-1 over I-25 Nbl and Sbl in Socorro County, New Mexico. It was built in 1968, so it is 57 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 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 27 vehicles a day, roughly 11% of them trucks, projected to reach 36 by 2043. The structure is 413 ft (125.9 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNM-1
CrossesI-25 Nbl and Sbl
Location9.7 MI N of Sierra Cl
RouteState Highway 1
CountySocorro County
StateNew Mexico
Coordinates33.60689, -107.15246
Functional classRural Minor 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
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 inspectionApril 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 geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.7 US tons
Inventory rating31.3 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length413 ft (125.9 m)
Longest span100 ft (30.5 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27 (2023)
Projected traffic36 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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$947,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-1 over I-25 Nbl and Sbl built?

It was built in 1968, making it 57 years old in 2025.

What condition is NM-1 over I-25 Nbl and 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 April 2024.

How much traffic does NM-1 over I-25 Nbl and Sbl carry?

About 27 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-1 over I-25 Nbl and Sbl?

The structure is 413 ft (125.9 m) long with a longest span of 100 ft (30.5 m) and a deck 34 ft wide.

Who owns NM-1 over I-25 Nbl and Sbl?

It is owned by the State Highway Agency.