US Bridges

FL-4923 over Unammed Waterway

Good

Otero County, New Mexico · 1.3 MI N JCT US 70/ALAMOG · Structure no. 000000000009624

Built
2013
12 years old
Condition
Good
inspected April 2021
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
23,689
2023 count
Owner
State
State Highway Agency

About this bridge

FL-4923 over Unammed Waterway is a concrete culvert carrying FL-4923 over Unammed Waterway in Otero County, New Mexico. It was built in 2013, so it is 12 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 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 23,689 vehicles a day, roughly 13% of them trucks, projected to reach 32,217 by 2043. The structure is 32 ft (9.8 m) long and 106 ft wide.

Location

Open in Google Maps
CarriesFL-4923
CrossesUnammed Waterway
Location1.3 MI N JCT US 70/ALAMOG
RouteCity Street 4923
CountyOtero County
StateNew Mexico
Coordinates32.88559, -105.96019
Functional classUrban Other Principal Arterial

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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionApril 2021
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 rating56.9 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHL 93
Structure length32 ft (9.8 m)
Longest span10 ft (3 m)
Deck width106 ft (32.3 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 closed—
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$300,000 (2080 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was FL-4923 over Unammed Waterway built?

It was built in 2013, making it 12 years old in 2025.

What condition is FL-4923 over Unammed 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 April 2021.

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

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

How long is FL-4923 over Unammed Waterway?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m) and a deck 106 ft wide.

Who owns FL-4923 over Unammed Waterway?

It is owned by the State Highway Agency.