US Bridges

I-25 Sbl over County RD-21

Fair

San Miguel County, New Mexico · 1.4 MI S of JCT NM-104 · Structure no. 000000000008240

Built
1982
43 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
134 ft
3 main spans
Daily traffic
9,446
2023 count
Owner
State
State Highway Agency

About this bridge

I-25 Sbl over County RD-21 is a prestressed concrete continuous stringer/multi-beam or girder carrying I-25 Sbl over County RD-21 in San Miguel County, New Mexico. It was built in 1982, so it is 43 years old, younger 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 9,446 vehicles a day, roughly 45% of them trucks, projected to reach 12,846 by 2043. The structure is 134 ft (40.8 m) long and 45 ft wide.

CarriesI-25 Sbl
CrossesCounty RD-21
Location1.4 MI S of JCT NM-104
RouteInterstate 25
Coordinates35.57572, -105.21245
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating37 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length134 ft (40.8 m)
Longest span56 ft (17.1 m)
Deck width45 ft (13.7 m)
Roadway width41 ft (12.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,446 (2023)
Projected traffic12,846 by 2043
Trucks45%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 Sbl over County RD-21 built?

It was built in 1982, making it 43 years old in 2025.

What condition is I-25 Sbl over County RD-21 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 2024.

How much traffic does I-25 Sbl over County RD-21 carry?

About 9,446 vehicles per day (2023 count), of which roughly 45% are trucks.

How long is I-25 Sbl over County RD-21?

The structure is 134 ft (40.8 m) long with a longest span of 56 ft (17.1 m) and a deck 45 ft wide.

Who owns I-25 Sbl over County RD-21?

It is owned by the State Highway Agency.