US Bridges

I85N over NC55

Good

Durham County, North Carolina · 1.1 Mi. N. Jct. US501 · Structure no. 000000000630167

Built
2005
20 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
251 ft
3 main spans
Daily traffic
80,000
2020 count
Owner
State
State Highway Agency

About this bridge

I85N over NC55 is a steel stringer/multi-beam or girder carrying I85N over NC55 in Durham County, North Carolina. It was built in 2005, so it is 20 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 80,000 vehicles a day, roughly 16% of them trucks, projected to reach 160,000 by 2040. The structure is 251 ft (76.5 m) long and 74 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI85N
CrossesNC55
Location1.1 Mi. N. Jct. US501
RouteInterstate 85
Coordinates36.01409, -78.88727
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.
Substructure8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.9 US tons
Inventory rating53.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length251 ft (76.5 m)
Longest span141 ft (42.9 m)
Deck width74 ft (22.5 m)
Roadway width71 ft (21.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80,000 (2020)
Projected traffic160,000 by 2040
Trucks16%
Lanes on structure4
Traffic directionOne-way traffic
CarriesOverpass structure at an 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 I85N over NC55 built?

It was built in 2005, making it 20 years old in 2025.

What condition is I85N over NC55 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 June 2023.

How much traffic does I85N over NC55 carry?

About 80,000 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I85N over NC55?

The structure is 251 ft (76.5 m) long with a longest span of 141 ft (42.9 m) and a deck 74 ft wide.

Who owns I85N over NC55?

It is owned by the State Highway Agency.