US Bridges

I-70 (SR-70) Wbl over Mill Creek

Fair

Sevier County, Utah · 1 Mi. West Belknap Int. · Structure no. 4C 685

Built
1982
43 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
438 ft
3 main spans
Daily traffic
5,328
2023 count
Owner
State
State Highway Agency

About this bridge

I-70 (SR-70) Wbl over Mill Creek is a steel continuous stringer/multi-beam or girder carrying I-70 (SR-70) Wbl over Mill Creek in Sevier County, Utah. It was built in 1982, so it is 43 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 5,328 vehicles a day, roughly 46% of them trucks, projected to reach 6,394 by 2043. The structure is 438 ft (133.5 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
CrossesMill Creek
Location1 Mi. West Belknap Int.
RouteInterstate 70
CountySevier County
StateUtah
Coordinates38.54776, -112.37963
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating105.1 US tons
Inventory rating58.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length438 ft (133.5 m)
Longest span190 ft (57.9 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,328 (2023)
Projected traffic6,394 by 2043
Trucks46%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
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-70 (SR-70) Wbl over Mill Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is I-70 (SR-70) Wbl over Mill Creek 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 May 2023.

How much traffic does I-70 (SR-70) Wbl over Mill Creek carry?

About 5,328 vehicles per day (2023 count), of which roughly 46% are trucks.

How long is I-70 (SR-70) Wbl over Mill Creek?

The structure is 438 ft (133.5 m) long with a longest span of 190 ft (57.9 m) and a deck 44 ft wide.

Who owns I-70 (SR-70) Wbl over Mill Creek?

It is owned by the State Highway Agency.