US Bridges

SR-28 over I-15 (SR-15) Nbl & S

Poor

Juab County, Utah · North Nephi Interchange · Structure no. 0C 717

Built
1984
41 years old, rebuilt 2006
Condition
Poor
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
394 ft
2 main spans
Daily traffic
7,336
2017 count
Owner
State
State Highway Agency

About this bridge

SR-28 over I-15 (SR-15) Nbl & S is a steel continuous stringer/multi-beam or girder carrying SR-28 over I-15 (SR-15) Nbl & S in Juab County, Utah. It was built in 1984 and reconstructed in 2006, so it is 41 years old, older than the Utah average of 40.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 7,336 vehicles a day, roughly 22% of them trucks, projected to reach 8,803 by 2037. The structure is 394 ft (120.1 m) long and 58 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSR-28
CrossesI-15 (SR-15) Nbl & S
LocationNorth Nephi Interchange
RouteState Highway 28
CountyJuab County
StateUtah
Coordinates39.74861, -111.83472
Functional classUrban Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.3 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length394 ft (120.1 m)
Longest span208 ft (63.5 m)
Deck width58 ft (17.8 m)
Roadway width55 ft (16.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,336 (2017)
Projected traffic8,803 by 2037
Trucks22%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

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 SR-28 over I-15 (SR-15) Nbl & S built?

It was built in 1984, making it 41 years old in 2025. It was reconstructed in 2006.

What condition is SR-28 over I-15 (SR-15) Nbl & S in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does SR-28 over I-15 (SR-15) Nbl & S carry?

About 7,336 vehicles per day (2017 count), of which roughly 22% are trucks.

How long is SR-28 over I-15 (SR-15) Nbl & S?

The structure is 394 ft (120.1 m) long with a longest span of 208 ft (63.5 m) and a deck 58 ft wide.

Who owns SR-28 over I-15 (SR-15) Nbl & S?

It is owned by the State Highway Agency.