US Bridges

SR-79 31st Street over I-15 (SR-15)

Fair

Weber County, Utah · 31st St. Intchg. in Ogden · Structure no. 0C 945

Built
2008
17 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
175 ft
1 main span
Daily traffic
26,601
2021 count
Owner
State
State Highway Agency

About this bridge

SR-79 31st Street over I-15 (SR-15) is a steel stringer/multi-beam or girder carrying SR-79 31st Street over I-15 (SR-15) in Weber County, Utah. It was built in 2008, so it is 17 years old, younger 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 26,601 vehicles a day, roughly 26% of them trucks, projected to reach 31,921 by 2041. The structure is 175 ft (53.3 m) long and 123 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSR-79 31st Street
CrossesI-15 (SR-15)
Location31st St. Intchg. in Ogden
RouteState Highway 79
CountyWeber County
StateUtah
Coordinates41.20524, -111.99468
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.7 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length175 ft (53.3 m)
Longest span172 ft (52.4 m)
Deck width123 ft (37.4 m)
Roadway width120 ft (36.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,601 (2021)
Projected traffic31,921 by 2041
Trucks26%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 SR-79 31st Street over I-15 (SR-15) built?

It was built in 2008, making it 17 years old in 2025.

What condition is SR-79 31st Street over I-15 (SR-15) 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 August 2023.

How much traffic does SR-79 31st Street over I-15 (SR-15) carry?

About 26,601 vehicles per day (2021 count), of which roughly 26% are trucks.

How long is SR-79 31st Street over I-15 (SR-15)?

The structure is 175 ft (53.3 m) long with a longest span of 172 ft (52.4 m) and a deck 123 ft wide.

Who owns SR-79 31st Street over I-15 (SR-15)?

It is owned by the State Highway Agency.