US Bridges

NM-55 over Unnamed Waterway

Good

Torrance County, New Mexico · 7.20 MI S of NM-337 · Structure no. 000000000005603

Built
1948
77 years old
Condition
Good
inspected November 2024
Type
Culvert
Concrete
Length
61 ft
7 main spans
Daily traffic
710
2023 count
Owner
State
State Highway Agency

About this bridge

NM-55 over Unnamed Waterway is a concrete culvert carrying NM-55 over Unnamed Waterway in Torrance County, New Mexico. It was built in 1948, so it is 77 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 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 710 vehicles a day, roughly 11% of them trucks, projected to reach 965 by 2043. The structure is 61 ft (18.7 m) long. If it were closed, the detour would be 49.7 mi (80 km).

CarriesNM-55
CrossesUnnamed Waterway
Location7.20 MI S of NM-337
RouteState Highway 55
Coordinates34.69457, -106.30324
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans7
Design loadHS 20
Structure length61 ft (18.7 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic710 (2023)
Projected traffic965 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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-55 over Unnamed Waterway built?

It was built in 1948, making it 77 years old in 2025.

What condition is NM-55 over Unnamed Waterway 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 November 2024.

How much traffic does NM-55 over Unnamed Waterway carry?

About 710 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-55 over Unnamed Waterway?

The structure is 61 ft (18.7 m) long with a longest span of 8 ft (2.4 m).

Who owns NM-55 over Unnamed Waterway?

It is owned by the State Highway Agency.