US Bridges

I85 N Ramp US421S over I73 US220

Good

Guilford County, North Carolina · 0.3 Mi. N. Jct. SR1392 · Structure no. 000000000810802

Built
2003
22 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
310 ft
3 main spans
Daily traffic
2,300
2022 count
Owner
State
State Highway Agency

About this bridge

I85 N Ramp US421S over I73 US220 is a steel continuous stringer/multi-beam or girder carrying I85 N Ramp US421S over I73 US220 in Guilford County, North Carolina. It was built in 2003, so it is 22 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 2,300 vehicles a day, roughly 16% of them trucks, projected to reach 4,600 by 2040. The structure is 310 ft (94.4 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI85 N Ramp US421S
CrossesI73 US220
Location0.3 Mi. N. Jct. SR1392
RouteInterstate 85
CountyGuilford County
StateNorth Carolina
Coordinates36.00247, -79.82747
Functional classUrban Principal Arterial - Interstate

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length310 ft (94.4 m)
Longest span132 ft (40.2 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,300 (2022)
Projected traffic4,600 by 2040
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I85 N Ramp US421S over I73 US220 built?

It was built in 2003, making it 22 years old in 2025.

What condition is I85 N Ramp US421S over I73 US220 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 October 2023.

How much traffic does I85 N Ramp US421S over I73 US220 carry?

About 2,300 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is I85 N Ramp US421S over I73 US220?

The structure is 310 ft (94.4 m) long with a longest span of 132 ft (40.2 m) and a deck 29 ft wide.

Who owns I85 N Ramp US421S over I73 US220?

It is owned by the State Highway Agency.