US Bridges

I-15 (SR-15) Sbl over SR-28 Intchg. X-Rd

Fair

Juab County, Utah · South Nephi Interchange · Structure no. 3C 714

Built
1983
42 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
170 ft
1 main span
Daily traffic
34,167
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over SR-28 Intchg. X-Rd is a steel stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over SR-28 Intchg. X-Rd in Juab County, Utah. It was built in 1983, so it is 42 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 34,167 vehicles a day, roughly 32% of them trucks, projected to reach 41,000 by 2043. The structure is 170 ft (51.7 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-15 (SR-15) Sbl
CrossesSR-28 Intchg. X-Rd
LocationSouth Nephi Interchange
RouteInterstate 15
CountyJuab County
StateUtah
Coordinates39.68188, -111.83868
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating74.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length170 ft (51.7 m)
Longest span166 ft (50.6 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic34,167 (2023)
Projected traffic41,000 by 2043
Trucks32%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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-15 (SR-15) Sbl over SR-28 Intchg. X-Rd built?

It was built in 1983, making it 42 years old in 2025.

What condition is I-15 (SR-15) Sbl over SR-28 Intchg. X-Rd 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 March 2023.

How much traffic does I-15 (SR-15) Sbl over SR-28 Intchg. X-Rd carry?

About 34,167 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is I-15 (SR-15) Sbl over SR-28 Intchg. X-Rd?

The structure is 170 ft (51.7 m) long with a longest span of 166 ft (50.6 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Sbl over SR-28 Intchg. X-Rd?

It is owned by the State Highway Agency.