US Bridges

I-15 NB over I-15 over 300 West

Good

Utah County, Utah · I-15 over 300 W in Lehi · Structure no. 1F 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
179,486
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 NB over I-15 over 300 West is a concrete stringer/multi-beam or girder carrying I-15 NB 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 179,486 vehicles a day, roughly 14% of them trucks, projected to reach 215,383 by 2042. The structure is 104 ft (31.7 m) long and 110 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-15 NB
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.3 US tons
Inventory rating35.7 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 width110 ft (33.6 m)
Roadway width99 ft (30.2 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic179,486 (2022)
Projected traffic215,383 by 2042
Trucks14%
Lanes on structure7
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 NB over I-15 over 300 West built?

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

What condition is I-15 NB 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 NB over I-15 over 300 West carry?

About 179,486 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is I-15 NB 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 110 ft wide.

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

It is owned by the State Highway Agency.