US Bridges

FL-4920 over Mckinley Ditch

Fair

Otero County, New Mexico · 1.2 MI N 1st/ALAMOGORDO · Structure no. 000000000007052

Built
1940
85 years old
Condition
Fair
inspected June 2023
Type
Tee Beam
Prestressed Concrete
Length
28 ft
1 main span
Daily traffic
7,578
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

FL-4920 over Mckinley Ditch is a prestressed concrete tee beam carrying FL-4920 over Mckinley Ditch in Otero County, New Mexico. It was built in 1940, so it is 85 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 7,578 vehicles a day, roughly 5% of them trucks, projected to reach 10,306 by 2043. The structure is 28 ft (8.5 m) long and 95 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesFL-4920
CrossesMckinley Ditch
Location1.2 MI N 1st/ALAMOGORDO
RouteCity Street 4920
CountyOtero County
StateNew Mexico
Coordinates32.90443, -105.9257
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadH 15
Structure length28 ft (8.5 m)
Longest span24 ft (7.3 m)
Deck width95 ft (29 m)
Roadway width82 ft (25 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,578 (2023)
Projected traffic10,306 by 2043
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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-4920 over Mckinley Ditch built?

It was built in 1940, making it 85 years old in 2025.

What condition is FL-4920 over Mckinley Ditch 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 FL-4920 over Mckinley Ditch carry?

About 7,578 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is FL-4920 over Mckinley Ditch?

The structure is 28 ft (8.5 m) long with a longest span of 24 ft (7.3 m) and a deck 95 ft wide.

Who owns FL-4920 over Mckinley Ditch?

It is owned by the City or Municipal Highway Agency.