US Bridges

US15/501 Nbl over NC751

Fair

Durham County, North Carolina · 1.0 Mi. S. Jct. SR1317 · Structure no. 000000000630109

Built
1956
69 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
130 ft
3 main spans
Daily traffic
71,500
2021 count
Owner
State
State Highway Agency

About this bridge

US15/501 Nbl over NC751 is a steel stringer/multi-beam or girder carrying US15/501 Nbl over NC751 in Durham County, North Carolina. It was built in 1956, so it is 69 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 5 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 71,500 vehicles a day, roughly 12% of them trucks, projected to reach 143,000 by 2040. The structure is 130 ft (39.6 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS15/501 Nbl
CrossesNC751
Location1.0 Mi. S. Jct. SR1317
RouteU.S. Route 15
CountyDurham County
StateNorth Carolina
Coordinates35.99868, -78.95811
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating37.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length130 ft (39.6 m)
Longest span57 ft (17.3 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71,500 (2021)
Projected traffic143,000 by 2040
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US15/501 Nbl over NC751 built?

It was built in 1956, making it 69 years old in 2025.

What condition is US15/501 Nbl over NC751 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 US15/501 Nbl over NC751 carry?

About 71,500 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is US15/501 Nbl over NC751?

The structure is 130 ft (39.6 m) long with a longest span of 57 ft (17.3 m) and a deck 33 ft wide.

Who owns US15/501 Nbl over NC751?

It is owned by the State Highway Agency.