US Bridges

NC150 over I40 Bus US158 US421

Good

Forsyth County, North Carolina · 1.7 Mi. N. Jct. I-40 · Structure no. 000000000670278

Built
2018
7 years old
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
178 ft
2 main spans
Daily traffic
20,000
2021 count
Owner
State
State Highway Agency

About this bridge

NC150 over I40 Bus US158 US421 is a prestressed concrete stringer/multi-beam or girder carrying NC150 over I40 Bus US158 US421 in Forsyth County, North Carolina. It was built in 2018, so it is 7 years old, younger than the North Carolina average of 38.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 20,000 vehicles a day, roughly 12% of them trucks, projected to reach 40,000 by 2040. The structure is 178 ft (54.2 m) long and 124 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesNC150
CrossesI40 Bus US158 US421
Location1.7 Mi. N. Jct. I-40
RouteState Highway 150
Coordinates36.08954, -80.25741
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.9 US tons
Inventory rating58 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length178 ft (54.2 m)
Longest span85 ft (25.9 m)
Deck width124 ft (37.9 m)
Roadway width95 ft (29.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,000 (2021)
Projected traffic40,000 by 2040
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed0.6 mi (1 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 NC150 over I40 Bus US158 US421 built?

It was built in 2018, making it 7 years old in 2025.

What condition is NC150 over I40 Bus US158 US421 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does NC150 over I40 Bus US158 US421 carry?

About 20,000 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is NC150 over I40 Bus US158 US421?

The structure is 178 ft (54.2 m) long with a longest span of 85 ft (25.9 m) and a deck 124 ft wide.

Who owns NC150 over I40 Bus US158 US421?

It is owned by the State Highway Agency.