US Bridges

I-85S US70W.RAMP over I85 US15

Good

Durham County, North Carolina · 0.35 MI W JCT SR1670 · Structure no. 000000000630026

Built
2004
21 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
452 ft
2 main spans
Daily traffic
16,000
2022 count
Owner
State
State Highway Agency

About this bridge

I-85S US70W.RAMP over I85 US15 is a steel continuous stringer/multi-beam or girder carrying I-85S US70W.RAMP over I85 US15 in Durham County, North Carolina. It was built in 2004, so it is 21 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 16,000 vehicles a day, roughly 16% of them trucks, projected to reach 32,000 by 2040. The structure is 452 ft (137.7 m) long and 50 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI-85S US70W.RAMP
CrossesI85 US15
Location0.35 MI W JCT SR1670
RouteInterstate 85
CountyDurham County
StateNorth Carolina
Coordinates36.01347, -78.87082
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 inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating20.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length452 ft (137.7 m)
Longest span249 ft (75.8 m)
Deck width50 ft (15.2 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,000 (2022)
Projected traffic32,000 by 2040
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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 I-85S US70W.RAMP over I85 US15 built?

It was built in 2004, making it 21 years old in 2025.

What condition is I-85S US70W.RAMP over I85 US15 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 November 2023.

How much traffic does I-85S US70W.RAMP over I85 US15 carry?

About 16,000 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is I-85S US70W.RAMP over I85 US15?

The structure is 452 ft (137.7 m) long with a longest span of 249 ft (75.8 m) and a deck 50 ft wide.

Who owns I-85S US70W.RAMP over I85 US15?

It is owned by the State Highway Agency.