US Bridges

I-70 (SR-70) Wbl over Co.Rd. & Thompson Wa

Fair

Grand County, Utah · 0.6 Mi.W.Of Thompson Int · Structure no. 4F 339

Built
1975
50 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
194 ft
2 main spans
Daily traffic
10,152
2023 count
Owner
State
State Highway Agency

About this bridge

I-70 (SR-70) Wbl over Co.Rd. & Thompson Wa is a prestressed concrete continuous stringer/multi-beam or girder carrying I-70 (SR-70) Wbl over Co.Rd. & Thompson Wa in Grand County, Utah. It was built in 1975, so it is 50 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 10,152 vehicles a day, roughly 45% of them trucks, projected to reach 12,182 by 2043. The structure is 194 ft (59.2 m) long and 59 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
CrossesCo.Rd. & Thompson Wa
Location0.6 Mi.W.Of Thompson Int
RouteInterstate 70
CountyGrand County
StateUtah
Coordinates38.96043, -109.7315
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 geometry9: Superior to present desirable criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.7 US tons
Inventory rating40 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length194 ft (59.2 m)
Longest span95 ft (29.1 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,152 (2023)
Projected traffic12,182 by 2043
Trucks45%
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 Co.Rd. & Thompson Wa built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-70 (SR-70) Wbl over Co.Rd. & Thompson Wa 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 September 2023.

How much traffic does I-70 (SR-70) Wbl over Co.Rd. & Thompson Wa carry?

About 10,152 vehicles per day (2023 count), of which roughly 45% are trucks.

How long is I-70 (SR-70) Wbl over Co.Rd. & Thompson Wa?

The structure is 194 ft (59.2 m) long with a longest span of 95 ft (29.1 m) and a deck 59 ft wide.

Who owns I-70 (SR-70) Wbl over Co.Rd. & Thompson Wa?

It is owned by the State Highway Agency.