US Bridges

NC147S over SR1171

Fair

Durham County, North Carolina · 1.5 MI.S.JCT.NC55 · Structure no. 000000000630191

Built
1970
55 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
174 ft
3 main spans
Daily traffic
56,000
2020 count
Owner
State
State Highway Agency

About this bridge

NC147S over SR1171 is a steel stringer/multi-beam or girder carrying NC147S over SR1171 in Durham County, North Carolina. It was built in 1970, 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 56,000 vehicles a day, roughly 12% of them trucks, projected to reach 112,000 by 2040. The structure is 174 ft (53 m) long and 63 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesNC147S
CrossesSR1171
Location1.5 MI.S.JCT.NC55
RouteState Highway 147
CountyDurham County
StateNorth Carolina
Coordinates35.96968, -78.8685
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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length174 ft (53 m)
Longest span93 ft (28.3 m)
Deck width63 ft (19.3 m)
Roadway width59 ft (17.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,000 (2020)
Projected traffic112,000 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 NC147S over SR1171 built?

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

What condition is NC147S 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 NC147S over SR1171 carry?

About 56,000 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is NC147S over SR1171?

The structure is 174 ft (53 m) long with a longest span of 93 ft (28.3 m) and a deck 63 ft wide.

Who owns NC147S over SR1171?

It is owned by the State Highway Agency.