US Bridges

US 421S.RAMP over Winston Salem Northern B

Good

Forsyth County, North Carolina · .4 MI.S.JCT.US.421 N Ramp · Structure no. 000000000670681

Built
2014
11 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
306 ft
3 main spans
Daily traffic
4,500
2022 count
Owner
State
State Highway Agency

About this bridge

US 421S.RAMP over Winston Salem Northern B is a prestressed concrete stringer/multi-beam or girder carrying US 421S.RAMP over Winston Salem Northern B in Forsyth County, North Carolina. It was built in 2014, so it is 11 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 4,500 vehicles a day, roughly 12% of them trucks, projected to reach 9,000 by 2040. The structure is 306 ft (93.2 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS 421S.RAMP
CrossesWinston Salem Northern B
Location.4 MI.S.JCT.US.421 N Ramp
RouteU.S. Route 421
CountyForsyth County
StateNorth Carolina
Coordinates36.11113, -80.13054
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 inspectionApril 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 rating67.9 US tons
Inventory rating51.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length306 ft (93.2 m)
Longest span122 ft (37.1 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,500 (2022)
Projected traffic9,000 by 2040
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 421S.RAMP over Winston Salem Northern B built?

It was built in 2014, making it 11 years old in 2025.

What condition is US 421S.RAMP over Winston Salem Northern B 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 April 2024.

How much traffic does US 421S.RAMP over Winston Salem Northern B carry?

About 4,500 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is US 421S.RAMP over Winston Salem Northern B?

The structure is 306 ft (93.2 m) long with a longest span of 122 ft (37.1 m) and a deck 43 ft wide.

Who owns US 421S.RAMP over Winston Salem Northern B?

It is owned by the State Highway Agency.