US Bridges

I-15 SB over SR-9

Good

Washington County, Utah · I-15 over SR-9 · Structure no. 3F 894

Built
2020
5 years old
Condition
Good
inspected January 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
155 ft
1 main span
Daily traffic
30,540
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 SB over SR-9 is a prestressed concrete stringer/multi-beam or girder carrying I-15 SB over SR-9 in Washington County, Utah. It was built in 2020, so it is 5 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 30,540 vehicles a day, roughly 26% of them trucks, projected to reach 36,648 by 2043. The structure is 155 ft (47.2 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 SB
CrossesSR-9
LocationI-15 over SR-9
RouteInterstate 15
CountyWashington County
StateUtah
Coordinates37.16725, -113.45105
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length155 ft (47.2 m)
Longest span98 ft (29.9 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,540 (2023)
Projected traffic36,648 by 2043
Trucks26%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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 SB over SR-9 built?

It was built in 2020, making it 5 years old in 2025.

What condition is I-15 SB over SR-9 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-15 SB over SR-9 carry?

About 30,540 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is I-15 SB over SR-9?

The structure is 155 ft (47.2 m) long with a longest span of 98 ft (29.9 m) and a deck 63 ft wide.

Who owns I-15 SB over SR-9?

It is owned by the State Highway Agency.