US Bridges

I-70 (SR-70) Wbl over I-15 (SR-15) Nbl and Sbl

Fair

Millard County, Utah · Cove Fort Interchange · Structure no. 4C 543

Built
1973
52 years old, rebuilt 2023
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
238 ft
4 main spans
Daily traffic
4,915
2014 count
Owner
State
State Highway Agency

About this bridge

I-70 (SR-70) Wbl over I-15 (SR-15) Nbl and Sbl is a steel continuous stringer/multi-beam or girder carrying I-70 (SR-70) Wbl over I-15 (SR-15) Nbl and Sbl in Millard County, Utah. It was built in 1973 and reconstructed in 2023, so it is 52 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 5 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 4,915 vehicles a day, roughly 35% of them trucks, projected to reach 6,144 by 2034. The structure is 238 ft (72.5 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-70 (SR-70) Wbl
CrossesI-15 (SR-15) Nbl and Sbl
LocationCove Fort Interchange
RouteInterstate 70
CountyMillard County
StateUtah
Coordinates38.57778, -112.60306
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length238 ft (72.5 m)
Longest span81 ft (24.7 m)
Deck width44 ft (13.5 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,915 (2014)
Projected traffic6,144 by 2034
Trucks35%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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-70 (SR-70) Wbl over I-15 (SR-15) Nbl and Sbl built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2023.

What condition is I-70 (SR-70) Wbl over I-15 (SR-15) Nbl and Sbl 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-70 (SR-70) Wbl over I-15 (SR-15) Nbl and Sbl carry?

About 4,915 vehicles per day (2014 count), of which roughly 35% are trucks.

How long is I-70 (SR-70) Wbl over I-15 (SR-15) Nbl and Sbl?

The structure is 238 ft (72.5 m) long with a longest span of 81 ft (24.7 m) and a deck 44 ft wide.

Who owns I-70 (SR-70) Wbl over I-15 (SR-15) Nbl and Sbl?

It is owned by the State Highway Agency.