US Bridges

I-15 (SR-15) Sbl over County RD Int X-Road

Fair

Utah County, Utah · So.Santaquin Interchange · Structure no. 3F 197

Built
1973
52 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
105 ft
1 main span
Daily traffic
19,345
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over County RD Int X-Road is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over County RD Int X-Road in Utah County, Utah. It was built in 1973, so it is 52 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 19,345 vehicles a day, roughly 26% of them trucks, projected to reach 24,182 by 2034. The structure is 105 ft (31.9 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Sbl
CrossesCounty RD Int X-Road
LocationSo.Santaquin Interchange
RouteInterstate 15
CountyUtah County
StateUtah
Coordinates39.95083, -111.8025
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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.2 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length105 ft (31.9 m)
Longest span102 ft (31.1 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,345 (2014)
Projected traffic24,182 by 2034
Trucks26%
Lanes on structure2
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 County RD Int X-Road built?

It was built in 1973, making it 52 years old in 2025.

What condition is I-15 (SR-15) Sbl over County RD Int 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 March 2023.

How much traffic does I-15 (SR-15) Sbl over County RD Int X-Road carry?

About 19,345 vehicles per day (2014 count), of which roughly 26% are trucks.

How long is I-15 (SR-15) Sbl over County RD Int X-Road?

The structure is 105 ft (31.9 m) long with a longest span of 102 ft (31.1 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Sbl over County RD Int X-Road?

It is owned by the State Highway Agency.