US Bridges

NM-181 over Cedar Canyon

Fair

Sierra County, New Mexico · 1.25 MI S of EXIT-89/I-25 · Structure no. 000000000002076

Built
1939
86 years old
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
32 ft
5 main spans
Daily traffic
72
2023 count
Owner
State
State Highway Agency

About this bridge

NM-181 over Cedar Canyon is a concrete culvert carrying NM-181 over Cedar Canyon in Sierra County, New Mexico. It was built in 1939, so it is 86 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 72 vehicles a day, roughly 9% of them trucks, projected to reach 97 by 2043. The structure is 32 ft (9.9 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesNM-181
CrossesCedar Canyon
Location1.25 MI S of EXIT-89/I-25
RouteState Highway 181
Coordinates33.26979, -107.27919
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.8 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadH 15
Structure length32 ft (9.9 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic72 (2023)
Projected traffic97 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NM-181 over Cedar Canyon built?

It was built in 1939, making it 86 years old in 2025.

What condition is NM-181 over Cedar Canyon 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 January 2024.

How much traffic does NM-181 over Cedar Canyon carry?

About 72 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is NM-181 over Cedar Canyon?

The structure is 32 ft (9.9 m) long with a longest span of 6 ft (1.8 m).

Who owns NM-181 over Cedar Canyon?

It is owned by the State Highway Agency.