US Bridges

I-73 US421S over I85 I85 Ramp

Good

Guilford County, North Carolina · 0.1 Mi. N. Jct. I85 Bus · Structure no. 000000000810875

Built
2008
17 years old
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,015 ft
5 main spans
Daily traffic
22,750
2020 count
Owner
State
State Highway Agency

About this bridge

I-73 US421S over I85 I85 Ramp is a steel continuous stringer/multi-beam or girder carrying I-73 US421S over I85 I85 Ramp in Guilford County, North Carolina. It was built in 2008, so it is 17 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 22,750 vehicles a day, roughly 16% of them trucks, projected to reach 45,500 by 2040. The structure is 1,015 ft (309.3 m) long and 62 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI-73 US421S
CrossesI85 I85 Ramp
Location0.1 Mi. N. Jct. I85 Bus
RouteInterstate 73
Coordinates36.00324, -79.84758
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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.9 US tons
Inventory rating59 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length1,015 ft (309.3 m)
Longest span245 ft (74.6 m)
Deck width62 ft (18.9 m)
Roadway width59 ft (18 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,750 (2020)
Projected traffic45,500 by 2040
Trucks16%
Lanes on structure3
Traffic directionOne-way traffic
CarriesThird level (interchange)
CrossesHighway
Detour if closed0.6 mi (1 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-73 US421S over I85 I85 Ramp built?

It was built in 2008, making it 17 years old in 2025.

What condition is I-73 US421S over I85 I85 Ramp 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 I-73 US421S over I85 I85 Ramp carry?

About 22,750 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I-73 US421S over I85 I85 Ramp?

The structure is 1,015 ft (309.3 m) long with a longest span of 245 ft (74.6 m) and a deck 62 ft wide.

Who owns I-73 US421S over I85 I85 Ramp?

It is owned by the State Highway Agency.