US Bridges

SR-79 Wbl 31st. over Union Pacific Railroad

Fair

Weber County, Utah · .5 MI.E.OF31st.ST.INTCHG. · Structure no. 4C 314

Built
1960
65 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
419 ft
5 main spans
Daily traffic
11,181
2022 count
Owner
State
State Highway Agency

About this bridge

SR-79 Wbl 31st. over Union Pacific Railroad is a steel stringer/multi-beam or girder carrying SR-79 Wbl 31st. over Union Pacific Railroad in Weber County, Utah. It was built in 1960, so it is 65 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 11,181 vehicles a day, roughly 26% of them trucks, projected to reach 13,417 by 2042. The structure is 419 ft (127.7 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR-79 Wbl 31st.
CrossesUnion Pacific Railroad
Location.5 MI.E.OF31st.ST.INTCHG.
RouteState Highway 79
CountyWeber County
StateUtah
Coordinates41.20751, -111.98374
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length419 ft (127.7 m)
Longest span115 ft (35.1 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic11,181 (2022)
Projected traffic13,417 by 2042
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed3.1 mi (5 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 Wbl 31st. over Union Pacific Railroad built?

It was built in 1960, making it 65 years old in 2025.

What condition is SR-79 Wbl 31st. over Union Pacific Railroad 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 Wbl 31st. over Union Pacific Railroad carry?

About 11,181 vehicles per day (2022 count), of which roughly 26% are trucks.

How long is SR-79 Wbl 31st. over Union Pacific Railroad?

The structure is 419 ft (127.7 m) long with a longest span of 115 ft (35.1 m) and a deck 33 ft wide.

Who owns SR-79 Wbl 31st. over Union Pacific Railroad?

It is owned by the State Highway Agency.