US Bridges

I-15 (SR-15) Sbl over SR-164 Intchg. X-Road

Fair

Utah County, Utah · Benjamin Interchange · Structure no. 3C 470

Built
1968
57 years old, rebuilt 2013
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
114 ft
3 main spans
Daily traffic
47,875
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over SR-164 Intchg. X-Road is a steel continuous stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over SR-164 Intchg. X-Road in Utah County, Utah. It was built in 1968 and reconstructed in 2013, so it is 57 years old, older than the Utah average of 40.1 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 47,875 vehicles a day, roughly 26% of them trucks, projected to reach 59,844 by 2034. The structure is 114 ft (34.8 m) long and 61 ft wide.

Location

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CarriesI-15 (SR-15) Sbl
CrossesSR-164 Intchg. X-Road
LocationBenjamin Interchange
RouteInterstate 15
CountyUtah County
StateUtah
Coordinates40.08553, -111.7023
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 rating50 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length114 ft (34.8 m)
Longest span82 ft (25 m)
Deck width61 ft (18.5 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47,875 (2014)
Projected traffic59,844 by 2034
Trucks26%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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-15 (SR-15) Sbl over SR-164 Intchg. X-Road built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 2013.

What condition is I-15 (SR-15) Sbl over SR-164 Intchg. X-Road 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 September 2024.

How much traffic does I-15 (SR-15) Sbl over SR-164 Intchg. X-Road carry?

About 47,875 vehicles per day (2014 count), of which roughly 26% are trucks.

How long is I-15 (SR-15) Sbl over SR-164 Intchg. X-Road?

The structure is 114 ft (34.8 m) long with a longest span of 82 ft (25 m) and a deck 61 ft wide.

Who owns I-15 (SR-15) Sbl over SR-164 Intchg. X-Road?

It is owned by the State Highway Agency.