US Bridges

US-91 (SR-91) Nbl over Union Pacific Railroad

Fair

Box Elder County, Utah · 11th So. Brigham City · Structure no. 1C 451

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
176 ft
3 main spans
Daily traffic
22,593
2017 count
Owner
State
State Highway Agency

About this bridge

US-91 (SR-91) Nbl over Union Pacific Railroad is a steel continuous stringer/multi-beam or girder carrying US-91 (SR-91) Nbl over Union Pacific Railroad in Box Elder County, Utah. It was built in 1967, so it is 58 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 22,593 vehicles a day, roughly 24% of them trucks, projected to reach 27,112 by 2037. The structure is 176 ft (53.6 m) long and 34 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesUS-91 (SR-91) Nbl
CrossesUnion Pacific Railroad
Location11th So. Brigham City
RouteU.S. Route 91
CountyBox Elder County
StateUtah
Coordinates41.48617, -112.04398
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment7: Better than present minimum criteria
Operating rating66.5 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length176 ft (53.6 m)
Longest span116 ft (35.4 m)
Deck width34 ft (10.5 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,593 (2017)
Projected traffic27,112 by 2037
Trucks24%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 US-91 (SR-91) Nbl over Union Pacific Railroad built?

It was built in 1967, making it 58 years old in 2025.

What condition is US-91 (SR-91) Nbl 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 May 2023.

How much traffic does US-91 (SR-91) Nbl over Union Pacific Railroad carry?

About 22,593 vehicles per day (2017 count), of which roughly 24% are trucks.

How long is US-91 (SR-91) Nbl over Union Pacific Railroad?

The structure is 176 ft (53.6 m) long with a longest span of 116 ft (35.4 m) and a deck 34 ft wide.

Who owns US-91 (SR-91) Nbl over Union Pacific Railroad?

It is owned by the State Highway Agency.