US Bridges

FL-4903 over Unknown Waterway

Fair

Otero County, New Mexico · Tenth Street · Structure no. 000000000009149

Built
1960
65 years old
Condition
Fair
inspected March 2024
Type
Tee Beam
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
6,819
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

FL-4903 over Unknown Waterway is a prestressed concrete tee beam carrying FL-4903 over Unknown Waterway in Otero County, New Mexico. It was built in 1960, so it is 65 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 6,819 vehicles a day, roughly 5% of them trucks, projected to reach 9,273 by 2043. The structure is 28 ft (8.5 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesFL-4903
CrossesUnknown Waterway
LocationTenth Street
RouteCity Street 4903
CountyOtero County
StateNew Mexico
Coordinates32.89963, -105.93354
Functional classUrban Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating53.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span24 ft (7.3 m)
Deck width63 ft (19.2 m)
Roadway width50 ft (15.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,819 (2023)
Projected traffic9,273 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 FL-4903 over Unknown Waterway built?

It was built in 1960, making it 65 years old in 2025.

What condition is FL-4903 over Unknown 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 March 2024.

How much traffic does FL-4903 over Unknown Waterway carry?

About 6,819 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is FL-4903 over Unknown Waterway?

The structure is 28 ft (8.5 m) long with a longest span of 24 ft (7.3 m) and a deck 63 ft wide.

Who owns FL-4903 over Unknown Waterway?

It is owned by the City or Municipal Highway Agency.