US Bridges

US-40 (SR-40) over Grey Mountain Canal

Fair

Duchesne County, Utah · 10.0 MI East of Duchesne · Structure no. 0E1293

Built
1963
62 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
31 ft
2 main spans
Daily traffic
6,332
2022 count
Owner
State
State Highway Agency

About this bridge

US-40 (SR-40) over Grey Mountain Canal is a concrete continuous culvert carrying US-40 (SR-40) over Grey Mountain Canal in Duchesne County, Utah. It was built in 1963, so it is 62 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 6,332 vehicles a day, roughly 36% of them trucks, projected to reach 7,598 by 2042. The structure is 31 ft (9.5 m) long. If it were closed, the detour would be 75.2 mi (121 km).

Location

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CarriesUS-40 (SR-40)
CrossesGrey Mountain Canal
Location10.0 MI East of Duchesne
RouteU.S. Route 40
CountyDuchesne County
StateUtah
Coordinates40.15278, -110.23611
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.1 US tons
Inventory rating19.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length31 ft (9.5 m)
Longest span29 ft (8.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,332 (2022)
Projected traffic7,598 by 2042
Trucks36%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed75.2 mi (121 km)
TollOn a free road
National Highway SystemYes

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 US-40 (SR-40) over Grey Mountain Canal built?

It was built in 1963, making it 62 years old in 2025.

What condition is US-40 (SR-40) over Grey Mountain Canal 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 US-40 (SR-40) over Grey Mountain Canal carry?

About 6,332 vehicles per day (2022 count), of which roughly 36% are trucks.

How long is US-40 (SR-40) over Grey Mountain Canal?

The structure is 31 ft (9.5 m) long with a longest span of 29 ft (8.9 m).

Who owns US-40 (SR-40) over Grey Mountain Canal?

It is owned by the State Highway Agency.