US Bridges

I-15 (SR-15) Nbl over Beaver River

Fair

Beaver County, Utah · 1.1 Mi.No.So.Beaver Inter · Structure no. 1F 180

Built
1970
55 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
58 ft
1 main span
Daily traffic
23,081
2021 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Beaver River is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over Beaver River in Beaver County, Utah. It was built in 1970, so it is 55 years old, older 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 23,081 vehicles a day, roughly 44% of them trucks, projected to reach 27,697 by 2041. The structure is 58 ft (17.6 m) long and 41 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 (SR-15) Nbl
CrossesBeaver River
Location1.1 Mi.No.So.Beaver Inter
RouteInterstate 15
CountyBeaver County
StateUtah
Coordinates38.26496, -112.65018
Functional classRural 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length58 ft (17.6 m)
Longest span54 ft (16.5 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,081 (2021)
Projected traffic27,697 by 2041
Trucks44%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 (SR-15) Nbl over Beaver River built?

It was built in 1970, making it 55 years old in 2025.

What condition is I-15 (SR-15) Nbl over Beaver River 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-15 (SR-15) Nbl over Beaver River carry?

About 23,081 vehicles per day (2021 count), of which roughly 44% are trucks.

How long is I-15 (SR-15) Nbl over Beaver River?

The structure is 58 ft (17.6 m) long with a longest span of 54 ft (16.5 m) and a deck 41 ft wide.

Who owns I-15 (SR-15) Nbl over Beaver River?

It is owned by the State Highway Agency.