US Bridges

I-15SB (SR-15) over Santa Clara River

Good

Washington County, Utah · At Dixie Drive Interchang · Structure no. 3F 806

Built
2012
13 years old
Condition
Good
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
236 ft
3 main spans
Daily traffic
64,119
2023 count
Owner
State
State Highway Agency

About this bridge

I-15SB (SR-15) over Santa Clara River is a prestressed concrete continuous stringer/multi-beam or girder carrying I-15SB (SR-15) over Santa Clara River in Washington County, Utah. It was built in 2012, so it is 13 years old, younger than the Utah average of 40.1 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 64,119 vehicles a day, roughly 29% of them trucks, projected to reach 76,943 by 2043. The structure is 236 ft (72 m) long and 75 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15SB (SR-15)
CrossesSanta Clara River
LocationAt Dixie Drive Interchang
RouteInterstate 15
CountyWashington County
StateUtah
Coordinates37.07461, -113.58487
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating26.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length236 ft (72 m)
Longest span92 ft (28.1 m)
Deck width75 ft (22.8 m)
Roadway width72 ft (22 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic64,119 (2023)
Projected traffic76,943 by 2043
Trucks29%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

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-15SB (SR-15) over Santa Clara River built?

It was built in 2012, making it 13 years old in 2025.

What condition is I-15SB (SR-15) over Santa Clara River 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 January 2023.

How much traffic does I-15SB (SR-15) over Santa Clara River carry?

About 64,119 vehicles per day (2023 count), of which roughly 29% are trucks.

How long is I-15SB (SR-15) over Santa Clara River?

The structure is 236 ft (72 m) long with a longest span of 92 ft (28.1 m) and a deck 75 ft wide.

Who owns I-15SB (SR-15) over Santa Clara River?

It is owned by the State Highway Agency.