US Bridges

I85 SBL&US15 over SR1632

Fair

Durham County, North Carolina · .33 MI.S.JCT.SR1637 · Structure no. 000000000630201

Built
1965
60 years old, rebuilt 1997
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
127 ft
3 main spans
Daily traffic
42,500
2020 count
Owner
State
State Highway Agency

About this bridge

I85 SBL&US15 over SR1632 is a steel stringer/multi-beam or girder carrying I85 SBL&US15 over SR1632 in Durham County, North Carolina. It was built in 1965 and reconstructed in 1997, so it is 60 years old, older than the North Carolina average of 38.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 42,500 vehicles a day, roughly 16% of them trucks, projected to reach 85,000 by 2040. The structure is 127 ft (38.7 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesI85 SBL&US15
CrossesSR1632
Location.33 MI.S.JCT.SR1637
RouteInterstate 85
CountyDurham County
StateNorth Carolina
Coordinates36.04587, -78.81546
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.9 US tons
Inventory rating53.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length127 ft (38.7 m)
Longest span56 ft (17 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,500 (2020)
Projected traffic85,000 by 2040
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 I85 SBL&US15 over SR1632 built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1997.

What condition is I85 SBL&US15 over SR1632 in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.

How much traffic does I85 SBL&US15 over SR1632 carry?

About 42,500 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I85 SBL&US15 over SR1632?

The structure is 127 ft (38.7 m) long with a longest span of 56 ft (17 m) and a deck 43 ft wide.

Who owns I85 SBL&US15 over SR1632?

It is owned by the State Highway Agency.