US Bridges

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

Fair

Millard County, Utah · Kanosh Interchange · Structure no. 3P 4

Built
1972
53 years old
Condition
Fair
inspected February 2023
Type
Box Beam or Girders - Single or Spread
Concrete
Length
129 ft
1 main span
Daily traffic
22,567
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over Co. Rd. Inter X-Road is a concrete box beam or girders - single or spread carrying I-15 (SR-15) Sbl over Co. Rd. Inter X-Road in Millard County, Utah. It was built in 1972, so it is 53 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 2043. The structure is 129 ft (39.4 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Sbl
CrossesCo. Rd. Inter X-Road
LocationKanosh Interchange
RouteInterstate 15
CountyMillard County
StateUtah
Coordinates38.76512, -112.55517
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 evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating15 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length129 ft (39.4 m)
Longest span126 ft (38.3 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,567 (2023)
Projected traffic27,080 by 2043
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) Sbl over Co. Rd. Inter X-Road built?

It was built in 1972, making it 53 years old in 2025.

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

About 22,567 vehicles per day (2023 count), of which roughly 32% are trucks.

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

The structure is 129 ft (39.4 m) long with a longest span of 126 ft (38.3 m) and a deck 44 ft wide.

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

It is owned by the State Highway Agency.