US Bridges

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

Fair

Millard County, Utah · North Holden Interchange · Structure no. 0P 14

Built
1976
49 years old
Condition
Fair
inspected February 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
285 ft
2 main spans
Daily traffic
1,096
2021 count
Owner
State
State Highway Agency

About this bridge

US-50 (SR-50) over I-15 (SR-15) Nbl & S is a concrete continuous box beam or girders - multiple carrying US-50 (SR-50) over I-15 (SR-15) Nbl & S in Millard 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 1,096 vehicles a day, roughly 40% of them trucks, projected to reach 1,315 by 2041. The structure is 285 ft (86.9 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesUS-50 (SR-50)
CrossesI-15 (SR-15) Nbl & S
LocationNorth Holden Interchange
RouteU.S. Route 50
CountyMillard County
StateUtah
Coordinates39.1445, -112.23669
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 alignment6: Equal to present minimum criteria
Operating rating67.9 US tons
Inventory rating34 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length285 ft (86.9 m)
Longest span142 ft (43.3 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,096 (2021)
Projected traffic1,315 by 2041
Trucks40%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
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-50 (SR-50) over I-15 (SR-15) Nbl & S built?

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

What condition is US-50 (SR-50) over I-15 (SR-15) Nbl & S 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 & S carry?

About 1,096 vehicles per day (2021 count), of which roughly 40% are trucks.

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

The structure is 285 ft (86.9 m) long with a longest span of 142 ft (43.3 m) and a deck 34 ft wide.

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

It is owned by the State Highway Agency.