US Bridges

NC147N.RAMP over I85 US70 Bus.

Good

Durham County, North Carolina · JCT I85 & US70 Bus. · Structure no. 000000000630429

Built
1999
26 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
749 ft
5 main spans
Daily traffic
23,000
2022 count
Owner
State
State Highway Agency

About this bridge

NC147N.RAMP over I85 US70 Bus. is a steel stringer/multi-beam or girder carrying NC147N.RAMP over I85 US70 Bus. in Durham County, North Carolina. It was built in 1999, so it is 26 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 23,000 vehicles a day, roughly 12% of them trucks, projected to reach 46,000 by 2040. The structure is 749 ft (228.2 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesNC147N.RAMP
CrossesI85 US70 Bus.
LocationJCT I85 & US70 Bus.
RouteState Highway 147
CountyDurham County
StateNorth Carolina
Coordinates36.0318, -78.96312
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 inspectionDecember 2023
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 rating99 US tons
Inventory rating63.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20 + Mod
Structure length749 ft (228.2 m)
Longest span195 ft (59.4 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,000 (2022)
Projected traffic46,000 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 NC147N.RAMP over I85 US70 Bus. built?

It was built in 1999, making it 26 years old in 2025.

What condition is NC147N.RAMP over I85 US70 Bus. 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 December 2023.

How much traffic does NC147N.RAMP over I85 US70 Bus. carry?

About 23,000 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is NC147N.RAMP over I85 US70 Bus.?

The structure is 749 ft (228.2 m) long with a longest span of 195 ft (59.4 m) and a deck 41 ft wide.

Who owns NC147N.RAMP over I85 US70 Bus.?

It is owned by the State Highway Agency.