US Bridges

SR-104 Wbl 20th ST over Union Pacific Railroad

Fair

Weber County, Utah · 1.2 Mi.E.Of Wilson Ln.Int · Structure no. 4C 614

Built
1976
49 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
511 ft
3 main spans
Daily traffic
9,064
2017 count
Owner
State
State Highway Agency

About this bridge

SR-104 Wbl 20th ST over Union Pacific Railroad is a steel continuous stringer/multi-beam or girder carrying SR-104 Wbl 20th ST over Union Pacific Railroad in Weber County, Utah. It was built in 1976, so it is 49 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 9,064 vehicles a day, roughly 30% of them trucks, projected to reach 10,877 by 2037. The structure is 511 ft (155.8 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSR-104 Wbl 20th ST
CrossesUnion Pacific Railroad
Location1.2 Mi.E.Of Wilson Ln.Int
RouteState Highway 104
CountyWeber County
StateUtah
Coordinates41.23169, -111.98657
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 25 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating20.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length511 ft (155.8 m)
Longest span242 ft (73.9 m)
Deck width42 ft (12.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic9,064 (2017)
Projected traffic10,877 by 2037
Trucks30%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed3.1 mi (5 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-104 Wbl 20th ST over Union Pacific Railroad built?

It was built in 1976, making it 49 years old in 2025.

What condition is SR-104 Wbl 20th ST 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 July 2023.

How much traffic does SR-104 Wbl 20th ST over Union Pacific Railroad carry?

About 9,064 vehicles per day (2017 count), of which roughly 30% are trucks.

How long is SR-104 Wbl 20th ST over Union Pacific Railroad?

The structure is 511 ft (155.8 m) long with a longest span of 242 ft (73.9 m) and a deck 42 ft wide.

Who owns SR-104 Wbl 20th ST over Union Pacific Railroad?

It is owned by the State Highway Agency.