US Bridges

NM-187 over I-25 Nbl/Sbl

Fair

Sierra County, New Mexico · 4.2 M S Jct. I-25/NM-187 · Structure no. 000000000006581

Built
1965
60 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
267 ft
4 main spans
Daily traffic
1,093
2023 count
Owner
State
State Highway Agency

About this bridge

NM-187 over I-25 Nbl/Sbl is a prestressed concrete stringer/multi-beam or girder carrying NM-187 over I-25 Nbl/Sbl in Sierra County, New Mexico. It was built in 1965, so it is 60 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 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 1,093 vehicles a day, roughly 11% of them trucks, projected to reach 1,486 by 2043. The structure is 267 ft (81.4 m) long and 31 ft wide.

Location

Open in Google Maps
CarriesNM-187
CrossesI-25 Nbl/Sbl
Location4.2 M S Jct. I-25/NM-187
RouteState Highway 187
CountySierra County
StateNew Mexico
Coordinates32.89411, -107.31037
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length267 ft (81.4 m)
Longest span78 ft (23.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,093 (2023)
Projected traffic1,486 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$580,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-187 over I-25 Nbl/Sbl built?

It was built in 1965, making it 60 years old in 2025.

What condition is NM-187 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 September 2024.

How much traffic does NM-187 over I-25 Nbl/Sbl carry?

About 1,093 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-187 over I-25 Nbl/Sbl?

The structure is 267 ft (81.4 m) long with a longest span of 78 ft (23.8 m) and a deck 31 ft wide.

Who owns NM-187 over I-25 Nbl/Sbl?

It is owned by the State Highway Agency.