US Bridges

I-15 (SR-15) Nbl over Co. Rd. Inter X-Road

Fair

Millard County, Utah · Dog Valley Interchange · Structure no. 1D 741

Built
1966
59 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Concrete Continuous
Length
91 ft
3 main spans
Daily traffic
22,567
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Co. Rd. Inter X-Road is a concrete continuous tee beam carrying I-15 (SR-15) Nbl over Co. Rd. Inter X-Road in Millard County, Utah. It was built in 1966, so it is 59 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 22,567 vehicles a day, roughly 32% of them trucks, projected to reach 27,080 by 2042. The structure is 91 ft (27.8 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Nbl
CrossesCo. Rd. Inter X-Road
LocationDog Valley Interchange
RouteInterstate 15
CountyMillard County
StateUtah
Coordinates38.65895, -112.59394
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length91 ft (27.8 m)
Longest span35 ft (10.8 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,567 (2022)
Projected traffic27,080 by 2042
Trucks32%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 Co. Rd. Inter X-Road built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-15 (SR-15) Nbl over Co. Rd. Inter X-Road 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 Co. Rd. Inter X-Road carry?

About 22,567 vehicles per day (2022 count), of which roughly 32% are trucks.

How long is I-15 (SR-15) Nbl over Co. Rd. Inter X-Road?

The structure is 91 ft (27.8 m) long with a longest span of 35 ft (10.8 m) and a deck 41 ft wide.

Who owns I-15 (SR-15) Nbl over Co. Rd. Inter X-Road?

It is owned by the State Highway Agency.