US Bridges

NC147W over SR1171

Fair

Durham County, North Carolina · 1.5 MI S JCT NC55 · Structure no. 000000000630192

Built
1970
55 years old, rebuilt 2017
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
151 ft
3 main spans
Daily traffic
73,500
2021 count
Owner
State
State Highway Agency

About this bridge

NC147W over SR1171 is a steel stringer/multi-beam or girder carrying NC147W over SR1171 in Durham County, North Carolina. It was built in 1970 and reconstructed in 2017, so it is 55 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 73,500 vehicles a day, roughly 12% of them trucks, projected to reach 147,000 by 2040. The structure is 151 ft (46 m) long and 74 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesNC147W
CrossesSR1171
Location1.5 MI S JCT NC55
RouteState Highway 147
CountyDurham County
StateNorth Carolina
Coordinates35.97, -78.86842
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.9 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length151 ft (46 m)
Longest span77 ft (23.4 m)
Deck width74 ft (22.5 m)
Roadway width69 ft (21.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic73,500 (2021)
Projected traffic147,000 by 2040
Trucks12%
Lanes on structure4
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 NC147W over SR1171 built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 2017.

What condition is NC147W over SR1171 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 June 2023.

How much traffic does NC147W over SR1171 carry?

About 73,500 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is NC147W over SR1171?

The structure is 151 ft (46 m) long with a longest span of 77 ft (23.4 m) and a deck 74 ft wide.

Who owns NC147W over SR1171?

It is owned by the State Highway Agency.