US Bridges

I-25 Nbl/Sbl over Local ROAD/1st Street

Fair

Sierra County, New Mexico · 0.3 MI N Williamsburg · Structure no. 000000000007201

Built
1970
55 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
25 ft
1 main span
Daily traffic
5,858
2023 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl/Sbl over Local ROAD/1st Street is a concrete culvert carrying I-25 Nbl/Sbl over Local ROAD/1st Street in Sierra County, New Mexico. It was built in 1970, so it is 55 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 5,858 vehicles a day, roughly 45% of them trucks, projected to reach 7,966 by 2043. The structure is 25 ft (7.7 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesI-25 Nbl/Sbl
CrossesLocal ROAD/1st Street
Location0.3 MI N Williamsburg
RouteInterstate 25
CountySierra County
StateNew Mexico
Coordinates33.11887, -107.29756
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating72 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length25 ft (7.7 m)
Longest span25 ft (7.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,858 (2023)
Projected traffic7,966 by 2043
Trucks45%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$277,000 (2030 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-25 Nbl/Sbl over Local ROAD/1st Street built?

It was built in 1970, making it 55 years old in 2025.

What condition is I-25 Nbl/Sbl over Local ROAD/1st Street 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 July 2023.

How much traffic does I-25 Nbl/Sbl over Local ROAD/1st Street carry?

About 5,858 vehicles per day (2023 count), of which roughly 45% are trucks.

How long is I-25 Nbl/Sbl over Local ROAD/1st Street?

The structure is 25 ft (7.7 m) long with a longest span of 25 ft (7.7 m).

Who owns I-25 Nbl/Sbl over Local ROAD/1st Street?

It is owned by the State Highway Agency.