US Bridges

NC147NB over SR1320

Fair

Durham County, North Carolina · 0.3 MI N JCT SR1322 · Structure no. 000000000630327

Built
1991
34 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
104 ft
1 main span
Daily traffic
30,250
2022 count
Owner
State
State Highway Agency

About this bridge

NC147NB over SR1320 is a steel stringer/multi-beam or girder carrying NC147NB over SR1320 in Durham County, North Carolina. It was built in 1991, so it is 34 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 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 30,250 vehicles a day, roughly 12% of them trucks, projected to reach 60,500 by 2040. The structure is 104 ft (31.6 m) long and 53 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesNC147NB
CrossesSR1320
Location0.3 MI N JCT SR1322
RouteState Highway 147
CountyDurham County
StateNorth Carolina
Coordinates36.00537, -78.92341
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
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 spans1
Design loadHS 20 + Mod
Structure length104 ft (31.6 m)
Longest span96 ft (29.2 m)
Deck width53 ft (16.2 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,250 (2022)
Projected traffic60,500 by 2040
Trucks12%
Lanes on structure3
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 NC147NB over SR1320 built?

It was built in 1991, making it 34 years old in 2025.

What condition is NC147NB over SR1320 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 November 2024.

How much traffic does NC147NB over SR1320 carry?

About 30,250 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is NC147NB over SR1320?

The structure is 104 ft (31.6 m) long with a longest span of 96 ft (29.2 m) and a deck 53 ft wide.

Who owns NC147NB over SR1320?

It is owned by the State Highway Agency.