US Bridges

FL-4923 over Unnamed Waterway

Fair

Otero County, New Mexico · 1.1 M N JCT US70/ALAMOGOR · Structure no. 000000000002188

Built
1934
91 years old, rebuilt 1955
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
43 ft
4 main spans
Daily traffic
23,689
2023 count
Owner
State
State Highway Agency

About this bridge

FL-4923 over Unnamed Waterway is a concrete culvert carrying FL-4923 over Unnamed Waterway in Otero County, New Mexico. It was built in 1934 and reconstructed in 1955, so it is 91 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 23,689 vehicles a day, roughly 13% of them trucks, projected to reach 32,217 by 2043. The structure is 43 ft (13.1 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesFL-4923
CrossesUnnamed Waterway
Location1.1 M N JCT US70/ALAMOGOR
RouteCity Street 4923
CountyOtero County
StateNew Mexico
Coordinates32.88283, -105.96016
Functional classUrban Other Principal Arterial

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
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 rating59 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length43 ft (13.1 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 traffic23,689 (2023)
Projected traffic32,217 by 2043
Trucks13%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$352,000 (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was FL-4923 over Unnamed Waterway built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1955.

What condition is FL-4923 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 June 2024.

How much traffic does FL-4923 over Unnamed Waterway carry?

About 23,689 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is FL-4923 over Unnamed Waterway?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (3 m).

Who owns FL-4923 over Unnamed Waterway?

It is owned by the State Highway Agency.