US Bridges

NM-456 over Sloan Creek

Fair

Union County, New Mexico · 8 MI W of NM-406/NM-456 · Structure no. 000000000009291

Built
2005
20 years old
Condition
Fair
inspected June 2023
Type
Truss - Thru
Steel
Length
110 ft
1 main span
Daily traffic
35
2023 count
Owner
State
State Highway Agency

About this bridge

NM-456 over Sloan Creek is a steel truss - thru carrying NM-456 over Sloan Creek in Union County, New Mexico. It was built in 2005, so it is 20 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 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 35 vehicles a day, roughly 11% of them trucks, projected to reach 47 by 2043. The structure is 110 ft (33.5 m) long and 28 ft wide. If it were closed, the detour would be 75.2 mi (121 km).

CarriesNM-456
CrossesSloan Creek
Location8 MI W of NM-406/NM-456
RouteState Highway 456
Coordinates36.93791, -103.15309
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckSteel plate
Main spans1
Design loadHS 20
Structure length110 ft (33.5 m)
Longest span110 ft (33.5 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35 (2023)
Projected traffic47 by 2043
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed75.2 mi (121 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-456 over Sloan Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is NM-456 over Sloan Creek 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 June 2023.

How much traffic does NM-456 over Sloan Creek carry?

About 35 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is NM-456 over Sloan Creek?

The structure is 110 ft (33.5 m) long with a longest span of 110 ft (33.5 m) and a deck 28 ft wide.

Who owns NM-456 over Sloan Creek?

It is owned by the State Highway Agency.