US Bridges

I-15 Sbl over Washington Main Street

Good

Washington County, Utah · 1.1 Mi.No.Washington Int · Structure no. 3F 947

Built
2023
2 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
129 ft
1 main span
Daily traffic
5,400
2021 count
Owner
State
State Highway Agency

About this bridge

I-15 Sbl over Washington Main Street is a prestressed concrete stringer/multi-beam or girder carrying I-15 Sbl over Washington Main Street in Washington County, Utah. It was built in 2023, so it is 2 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,400 vehicles a day, roughly 34% of them trucks, projected to reach 68,400 by 2043. The structure is 129 ft (39.4 m) long and 66 ft wide.

CarriesI-15 Sbl
CrossesWashington Main Street
Location1.1 Mi.No.Washington Int
RouteInterstate 15
StateUtah
Coordinates37.1388, -113.51016
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 3 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating39.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length129 ft (39.4 m)
Longest span124 ft (37.9 m)
Deck width66 ft (20.2 m)
Roadway width64 ft (19.4 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic5,400 (2021)
Projected traffic68,400 by 2043
Trucks34%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
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 Sbl over Washington Main Street built?

It was built in 2023, making it 2 years old in 2025.

What condition is I-15 Sbl over Washington Main Street 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 October 2024.

How much traffic does I-15 Sbl over Washington Main Street carry?

About 5,400 vehicles per day (2021 count), of which roughly 34% are trucks.

How long is I-15 Sbl over Washington Main Street?

The structure is 129 ft (39.4 m) long with a longest span of 124 ft (37.9 m) and a deck 66 ft wide.

Who owns I-15 Sbl over Washington Main Street?

It is owned by the State Highway Agency.