US Bridges

I-25 Sbl over Mulligan Gulch

Fair

Socorro County, New Mexico · 16 MI N Sierra/Socorro Cl · Structure no. 000000000007671

Built
1981
44 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
331 ft
5 main spans
Daily traffic
6,438
2023 count
Owner
State
State Highway Agency

About this bridge

I-25 Sbl over Mulligan Gulch is a prestressed concrete continuous stringer/multi-beam or girder carrying I-25 Sbl over Mulligan Gulch in Socorro County, New Mexico. It was built in 1981, so it is 44 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 6,438 vehicles a day, roughly 45% of them trucks, projected to reach 8,755 by 2043. The structure is 331 ft (100.9 m) long and 45 ft wide.

Location

Open in Google Maps
CarriesI-25 Sbl
CrossesMulligan Gulch
Location16 MI N Sierra/Socorro Cl
RouteInterstate 25
CountySocorro County
StateNew Mexico
Coordinates33.66151, -107.09332
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.3 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length331 ft (100.9 m)
Longest span68 ft (20.7 m)
Deck width45 ft (13.7 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,438 (2023)
Projected traffic8,755 by 2043
Trucks45%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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 Mulligan Gulch built?

It was built in 1981, making it 44 years old in 2025.

What condition is I-25 Sbl over Mulligan Gulch 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 March 2024.

How much traffic does I-25 Sbl over Mulligan Gulch carry?

About 6,438 vehicles per day (2023 count), of which roughly 45% are trucks.

How long is I-25 Sbl over Mulligan Gulch?

The structure is 331 ft (100.9 m) long with a longest span of 68 ft (20.7 m) and a deck 45 ft wide.

Who owns I-25 Sbl over Mulligan Gulch?

It is owned by the State Highway Agency.