US Bridges

NM-549 over Unnamed Waterway

Fair

Luna County, New Mexico · 19.51 MI E of US-180 · Structure no. 000000000006687

Built
1967
58 years old
Condition
Fair
inspected December 2023
Type
Slab
Concrete Continuous
Length
192 ft
8 main spans
Daily traffic
819
2023 count
Owner
State
State Highway Agency

About this bridge

NM-549 over Unnamed Waterway is a concrete continuous slab carrying NM-549 over Unnamed Waterway in Luna County, New Mexico. It was built in 1967, so it is 58 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 819 vehicles a day, roughly 11% of them trucks, projected to reach 1,113 by 2043. The structure is 192 ft (58.4 m) long and 35 ft wide. If it were closed, the detour would be 29.8 mi (48 km).

Location

Open in Google Maps
CarriesNM-549
CrossesUnnamed Waterway
Location19.51 MI E of US-180
RouteState Highway 549
CountyLuna County
StateNew Mexico
Coordinates32.24021, -107.43295
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.8 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans8
Design loadHS 20
Structure length192 ft (58.4 m)
Longest span25 ft (7.6 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic819 (2023)
Projected traffic1,113 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed29.8 mi (48 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was NM-549 over Unnamed Waterway built?

It was built in 1967, making it 58 years old in 2025.

What condition is NM-549 over Unnamed Waterway 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 December 2023.

How much traffic does NM-549 over Unnamed Waterway carry?

About 819 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-549 over Unnamed Waterway?

The structure is 192 ft (58.4 m) long with a longest span of 25 ft (7.6 m) and a deck 35 ft wide.

Who owns NM-549 over Unnamed Waterway?

It is owned by the State Highway Agency.