US Bridges

I-15 SB over I-15 over 300 West

Good

Utah County, Utah · I-15 over 300 W in Lehi · Structure no. 3F 884

Built
2020
5 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Concrete
Length
104 ft
1 main span
Daily traffic
23,546
2020 count
Owner
State
State Highway Agency

About this bridge

I-15 SB over I-15 over 300 West is a concrete stringer/multi-beam or girder carrying I-15 SB over I-15 over 300 West in Utah 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 23,546 vehicles a day, roughly 14% of them trucks, projected to reach 208,750 by 2039. The structure is 104 ft (31.7 m) long and 100 ft wide.

Location

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CarriesI-15 SB
CrossesI-15 over 300 West
LocationI-15 over 300 W in Lehi
RouteInterstate 15
CountyUtah County
StateUtah
Coordinates40.40417, -111.85389
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.
Last inspectionFebruary 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 alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length104 ft (31.7 m)
Longest span99 ft (30.1 m)
Deck width100 ft (30.6 m)
Roadway width97 ft (29.6 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic23,546 (2020)
Projected traffic208,750 by 2039
Trucks14%
Lanes on structure6
Traffic directionTwo-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 SB over I-15 over 300 West built?

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

What condition is I-15 SB over I-15 over 300 West 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 February 2023.

How much traffic does I-15 SB over I-15 over 300 West carry?

About 23,546 vehicles per day (2020 count), of which roughly 14% are trucks.

How long is I-15 SB over I-15 over 300 West?

The structure is 104 ft (31.7 m) long with a longest span of 99 ft (30.1 m) and a deck 100 ft wide.

Who owns I-15 SB over I-15 over 300 West?

It is owned by the State Highway Agency.