US Bridges

US-6 (SR-6) over Union Pacific Railroad

Fair

Utah County, Utah · At Mouth Spanish Fk. Cyn. · Structure no. 0C 679

Built
1978
47 years old, rebuilt 2014
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
235 ft
3 main spans
Daily traffic
10,460
2014 count
Owner
State
State Highway Agency

About this bridge

US-6 (SR-6) over Union Pacific Railroad is a steel continuous stringer/multi-beam or girder carrying US-6 (SR-6) over Union Pacific Railroad in Utah County, Utah. It was built in 1978 and reconstructed in 2014, so it is 47 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 10,460 vehicles a day, roughly 39% of them trucks, projected to reach 13,075 by 2034. The structure is 235 ft (71.7 m) long and 59 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesUS-6 (SR-6)
CrossesUnion Pacific Railroad
LocationAt Mouth Spanish Fk. Cyn.
RouteU.S. Route 6
CountyUtah County
StateUtah
Coordinates40.08262, -111.58931
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, precast panels
Main spans3
Design loadHS 20 + Mod
Structure length235 ft (71.7 m)
Longest span111 ft (33.7 m)
Deck width59 ft (17.9 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,460 (2014)
Projected traffic13,075 by 2034
Trucks39%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed9.9 mi (16 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 US-6 (SR-6) over Union Pacific Railroad built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2014.

What condition is US-6 (SR-6) 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 September 2024.

How much traffic does US-6 (SR-6) over Union Pacific Railroad carry?

About 10,460 vehicles per day (2014 count), of which roughly 39% are trucks.

How long is US-6 (SR-6) over Union Pacific Railroad?

The structure is 235 ft (71.7 m) long with a longest span of 111 ft (33.7 m) and a deck 59 ft wide.

Who owns US-6 (SR-6) over Union Pacific Railroad?

It is owned by the State Highway Agency.