US Bridges

C-D a (I-15 Nb) over 7800S

Good

Salt Lake County, Utah · I-15 NB over 7800 S · Structure no. 1F 921

Built
2020
5 years old
Condition
Good
inspected December 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
189 ft
3 main spans
Daily traffic
54,400
2020 count
Owner
State
State Highway Agency

About this bridge

C-D a (I-15 Nb) over 7800S is a prestressed concrete stringer/multi-beam or girder carrying C-D a (I-15 Nb) over 7800S in Salt Lake County, Utah. It was built in 2020, so it is 5 years old, younger than the Utah average of 40.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 54,400 vehicles a day, roughly 20% of them trucks, projected to reach 58,800 by 2040. The structure is 189 ft (57.5 m) long and 63 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesC-D a (I-15 Nb)
Crosses7800S
LocationI-15 NB over 7800 S
RouteInterstate 15
CountySalt Lake County
StateUtah
Coordinates40.611, -111.906
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2022
Inspection intervalevery 22 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length189 ft (57.5 m)
Longest span97 ft (29.7 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic54,400 (2020)
Projected traffic58,800 by 2040
Trucks20%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 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 C-D a (I-15 Nb) over 7800S built?

It was built in 2020, making it 5 years old in 2025.

What condition is C-D a (I-15 Nb) over 7800S in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in December 2022.

How much traffic does C-D a (I-15 Nb) over 7800S carry?

About 54,400 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is C-D a (I-15 Nb) over 7800S?

The structure is 189 ft (57.5 m) long with a longest span of 97 ft (29.7 m) and a deck 63 ft wide.

Who owns C-D a (I-15 Nb) over 7800S?

It is owned by the State Highway Agency.