US Bridges

I-25 Nbl/Sbl over Unnamed Waterway

Good

San Miguel County, New Mexico · 15.9 MI N of NM-104 · Structure no. 000000000005302

Built
1947
78 years old, rebuilt 1967
Condition
Good
inspected May 2022
Type
Culvert
Concrete
Length
138 ft
16 main spans
Daily traffic
7,405
2023 count
Owner
State
State Highway Agency

About this bridge

I-25 Nbl/Sbl over Unnamed Waterway is a concrete culvert carrying I-25 Nbl/Sbl over Unnamed Waterway in San Miguel County, New Mexico. It was built in 1947 and reconstructed in 1967, so it is 78 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 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 7,405 vehicles a day, roughly 45% of them trucks, projected to reach 10,070 by 2043. The structure is 138 ft (42.1 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-25 Nbl/Sbl
CrossesUnnamed Waterway
Location15.9 MI N of NM-104
RouteInterstate 25
Coordinates35.75056, -105.02161
Functional classRural Principal Arterial - Interstate

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2022
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 rating39.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans16
Design loadHS 20 + Mod
Structure length138 ft (42.1 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,405 (2023)
Projected traffic10,070 by 2043
Trucks45%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-25 Nbl/Sbl over Unnamed Waterway built?

It was built in 1947, making it 78 years old in 2025. It was reconstructed in 1967.

What condition is I-25 Nbl/Sbl over Unnamed 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 May 2022.

How much traffic does I-25 Nbl/Sbl over Unnamed Waterway carry?

About 7,405 vehicles per day (2023 count), of which roughly 45% are trucks.

How long is I-25 Nbl/Sbl over Unnamed Waterway?

The structure is 138 ft (42.1 m) long with a longest span of 8 ft (2.4 m).

Who owns I-25 Nbl/Sbl over Unnamed Waterway?

It is owned by the State Highway Agency.