US Bridges

I85SB. US70W-BYP. over SR1401

Good

Durham County, North Carolina · 1.0 MI S JCT SR 1321. · Structure no. 000000000630112

Built
1998
27 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
258 ft
2 main spans
Daily traffic
19,250
2020 count
Owner
State
State Highway Agency

About this bridge

I85SB. US70W-BYP. over SR1401 is a steel stringer/multi-beam or girder carrying I85SB. US70W-BYP. over SR1401 in Durham County, North Carolina. It was built in 1998, so it is 27 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 19,250 vehicles a day, roughly 16% of them trucks, projected to reach 38,500 by 2040. The structure is 258 ft (78.6 m) long and 61 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI85SB. US70W-BYP.
CrossesSR1401
Location1.0 MI S JCT SR 1321.
RouteInterstate 85
CountyDurham County
StateNorth Carolina
Coordinates36.02537, -78.95351
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 inspectionSeptember 2023
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 rating99 US tons
Inventory rating59 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2 (+1 approach)
Design loadHS 20 + Mod
Structure length258 ft (78.6 m)
Longest span135 ft (41.1 m)
Deck width61 ft (18.6 m)
Roadway width58 ft (17.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,250 (2020)
Projected traffic38,500 by 2040
Trucks16%
Lanes on structure3
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 I85SB. US70W-BYP. over SR1401 built?

It was built in 1998, making it 27 years old in 2025.

What condition is I85SB. US70W-BYP. over SR1401 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 September 2023.

How much traffic does I85SB. US70W-BYP. over SR1401 carry?

About 19,250 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I85SB. US70W-BYP. over SR1401?

The structure is 258 ft (78.6 m) long with a longest span of 135 ft (41.1 m) and a deck 61 ft wide.

Who owns I85SB. US70W-BYP. over SR1401?

It is owned by the State Highway Agency.