US Bridges

I-15 NB over SR-9

Good

Washington County, Utah · I-15 over SR-9 · Structure no. 1F 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
20,325
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 NB over SR-9 is a prestressed concrete stringer/multi-beam or girder carrying I-15 NB 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 20,325 vehicles a day, roughly 27% of them trucks, projected to reach 25,407 by 2034. The structure is 155 ft (47.2 m) long and 63 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

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CarriesI-15 NB
CrossesSR-9
LocationI-15 over SR-9
RouteInterstate 15
CountyWashington County
StateUtah
Coordinates37.16713, -113.44973
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 geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.1 US tons
Inventory rating36 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 traffic20,325 (2014)
Projected traffic25,407 by 2034
Trucks27%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed16.8 mi (27 km)
TollOn a free road
National Highway SystemYes

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 NB over SR-9 built?

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

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

About 20,325 vehicles per day (2014 count), of which roughly 27% are trucks.

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

It is owned by the State Highway Agency.