US Bridges

I-15NB (SR-15) over 300 West Street

Fair

Utah County, Utah · 300 SO.300 W.In An. Fk. · Structure no. 1F 819

Built
2011
14 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
120 ft
1 main span
Daily traffic
209,636
2017 count
Owner
State
State Highway Agency

About this bridge

I-15NB (SR-15) over 300 West Street is a prestressed concrete stringer/multi-beam or girder carrying I-15NB (SR-15) over 300 West Street in Utah County, Utah. It was built in 2011, so it is 14 years old, younger than the Utah average of 40.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 209,636 vehicles a day, roughly 18% of them trucks, projected to reach 251,563 by 2037. The structure is 120 ft (36.6 m) long and 112 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI-15NB (SR-15)
Crosses300 West Street
Location300 SO.300 W.In An. Fk.
RouteInterstate 15
CountyUtah County
StateUtah
Coordinates40.37298, -111.80686
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
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 rating89.9 US tons
Inventory rating47.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length120 ft (36.6 m)
Longest span115 ft (35.1 m)
Deck width112 ft (34.2 m)
Roadway width110 ft (33.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic209,636 (2017)
Projected traffic251,563 by 2037
Trucks18%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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-15NB (SR-15) over 300 West Street built?

It was built in 2011, making it 14 years old in 2025.

What condition is I-15NB (SR-15) over 300 West Street in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in February 2023.

How much traffic does I-15NB (SR-15) over 300 West Street carry?

About 209,636 vehicles per day (2017 count), of which roughly 18% are trucks.

How long is I-15NB (SR-15) over 300 West Street?

The structure is 120 ft (36.6 m) long with a longest span of 115 ft (35.1 m) and a deck 112 ft wide.

Who owns I-15NB (SR-15) over 300 West Street?

It is owned by the State Highway Agency.