US Bridges

NM-400 over Unnamed Waterway

Fair

McKinley County, New Mexico · 0.1 MI S of JCT I-40 · Structure no. 000000000006527

Built
1963
62 years old
Condition
Fair
inspected May 2021
Type
Culvert
Concrete
Length
31 ft
3 main spans
Daily traffic
1,524
2023 count
Owner
State
State Highway Agency

About this bridge

NM-400 over Unnamed Waterway is a concrete culvert carrying NM-400 over Unnamed Waterway in McKinley County, New Mexico. It was built in 1963, so it is 62 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 1,524 vehicles a day, roughly 11% of them trucks, projected to reach 2,072 by 2043. The structure is 31 ft (9.6 m) long. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesNM-400
CrossesUnnamed Waterway
Location0.1 MI S of JCT I-40
RouteState Highway 400
CountyMcKinley County
StateNew Mexico
Coordinates35.51021, -108.54067
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length31 ft (9.6 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,524 (2023)
Projected traffic2,072 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was NM-400 over Unnamed Waterway built?

It was built in 1963, making it 62 years old in 2025.

What condition is NM-400 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 May 2021.

How much traffic does NM-400 over Unnamed Waterway carry?

About 1,524 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-400 over Unnamed Waterway?

The structure is 31 ft (9.6 m) long with a longest span of 10 ft (3 m).

Who owns NM-400 over Unnamed Waterway?

It is owned by the State Highway Agency.