US Bridges

NM-186 over LA Union Main Canal

Good

Dona Ana County, New Mexico · 0.7 MI E of JCT NM-28 · Structure no. 000000000009706

Built
2017
8 years old
Condition
Good
inspected March 2024
Type
Channel Beam
Prestressed Concrete
Length
52 ft
2 main spans
Daily traffic
892
2018 count
Owner
State
State Highway Agency

About this bridge

NM-186 over LA Union Main Canal is a prestressed concrete channel beam carrying NM-186 over LA Union Main Canal in Dona Ana County, New Mexico. It was built in 2017, so it is 8 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 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 892 vehicles a day, roughly 8% of them trucks, projected to reach 701 by 2038. The structure is 52 ft (15.8 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesNM-186
CrossesLA Union Main Canal
Location0.7 MI E of JCT NM-28
RouteState Highway 186
Coordinates32.02102, -106.65713
Functional classRural Major Collector

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating110.1 US tons
Inventory rating68.6 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length52 ft (15.8 m)
Longest span24 ft (7.3 m)
Deck width32 ft (9.8 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic892 (2018)
Projected traffic701 by 2038
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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-186 over LA Union Main Canal built?

It was built in 2017, making it 8 years old in 2025.

What condition is NM-186 over LA Union Main Canal 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 2024.

How much traffic does NM-186 over LA Union Main Canal carry?

About 892 vehicles per day (2018 count), of which roughly 8% are trucks.

How long is NM-186 over LA Union Main Canal?

The structure is 52 ft (15.8 m) long with a longest span of 24 ft (7.3 m) and a deck 32 ft wide.

Who owns NM-186 over LA Union Main Canal?

It is owned by the State Highway Agency.