US Bridges

FL-4658 over Gallinas River

Fair

San Miguel County, New Mexico · 0.1 MI W of 12th Street · Structure no. 000000000001549

Built
1909
116 years old
Condition
Fair
inspected January 2024
Type
Arch - Deck
Concrete Continuous
Length
136 ft
2 main spans
Daily traffic
6,684
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

FL-4658 over Gallinas River is a concrete continuous arch - deck carrying FL-4658 over Gallinas River in San Miguel County, New Mexico. It was built in 1909, so it is 116 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 5 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 6,684 vehicles a day, roughly 5% of them trucks, projected to reach 9,090 by 2043. The structure is 136 ft (41.5 m) long and 64 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFL-4658
CrossesGallinas River
Location0.1 MI W of 12th Street
RouteCity Street 4658
CountySan Miguel County
StateNew Mexico
Coordinates35.59382, -105.22378
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length136 ft (41.5 m)
Longest span68 ft (20.7 m)
Deck width64 ft (19.4 m)
Roadway width46 ft (13.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,684 (2023)
Projected traffic9,090 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was FL-4658 over Gallinas River built?

It was built in 1909, making it 116 years old in 2025.

What condition is FL-4658 over Gallinas River 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 January 2024.

How much traffic does FL-4658 over Gallinas River carry?

About 6,684 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is FL-4658 over Gallinas River?

The structure is 136 ft (41.5 m) long with a longest span of 68 ft (20.7 m) and a deck 64 ft wide.

Who owns FL-4658 over Gallinas River?

It is owned by the City or Municipal Highway Agency.