US Bridges

US-50 (SR-50) over I-15 (SR-15) Nbl & Sbl

Fair

Millard County, Utah · At Scipio Interchange · Structure no. 0C 731

Built
1985
40 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
287 ft
2 main spans
Daily traffic
5,249
2022 count
Owner
State
State Highway Agency

About this bridge

US-50 (SR-50) over I-15 (SR-15) Nbl & Sbl is a steel continuous stringer/multi-beam or girder carrying US-50 (SR-50) over I-15 (SR-15) Nbl & Sbl in Millard County, Utah. It was built in 1985, so it is 40 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 5,249 vehicles a day, roughly 53% of them trucks, projected to reach 6,299 by 2042. The structure is 287 ft (87.6 m) long and 42 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

Open in Google Maps
CarriesUS-50 (SR-50)
CrossesI-15 (SR-15) Nbl & Sbl
LocationAt Scipio Interchange
RouteU.S. Route 50
CountyMillard County
StateUtah
Coordinates39.25317, -112.1148
Functional classRural Principal Arterial - Other

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.3 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length287 ft (87.6 m)
Longest span142 ft (43.4 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic5,249 (2022)
Projected traffic6,299 by 2042
Trucks53%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed49.7 mi (80 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-50 (SR-50) over I-15 (SR-15) Nbl & Sbl built?

It was built in 1985, making it 40 years old in 2025.

What condition is US-50 (SR-50) over I-15 (SR-15) Nbl & Sbl 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 February 2023.

How much traffic does US-50 (SR-50) over I-15 (SR-15) Nbl & Sbl carry?

About 5,249 vehicles per day (2022 count), of which roughly 53% are trucks.

How long is US-50 (SR-50) over I-15 (SR-15) Nbl & Sbl?

The structure is 287 ft (87.6 m) long with a longest span of 142 ft (43.4 m) and a deck 42 ft wide.

Who owns US-50 (SR-50) over I-15 (SR-15) Nbl & Sbl?

It is owned by the State Highway Agency.