US Bridges

US15/US501NBL over SR1308

Poor

Durham County, North Carolina · 0.2MI.N.JCT.SR1303 · Structure no. 000000000630080

Built
1956
69 years old
Condition
Poor
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
150 ft
3 main spans
Daily traffic
51,000
2020 count
Owner
State
State Highway Agency

About this bridge

US15/US501NBL over SR1308 is a steel stringer/multi-beam or girder carrying US15/US501NBL over SR1308 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.

It carries about 51,000 vehicles a day, roughly 12% of them trucks, projected to reach 102,000 by 2040. The structure is 150 ft (45.7 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesUS15/US501NBL
CrossesSR1308
Location0.2MI.N.JCT.SR1303
RouteU.S. Route 15
Coordinates35.98374, -78.95789
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, would be posted or closed except for temporary shoring
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.9 US tons
Inventory rating31 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length150 ft (45.7 m)
Longest span56 ft (17 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51,000 (2020)
Projected traffic102,000 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US15/US501NBL over SR1308 built?

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

What condition is US15/US501NBL over SR1308 in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

How much traffic does US15/US501NBL over SR1308 carry?

About 51,000 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is US15/US501NBL over SR1308?

The structure is 150 ft (45.7 m) long with a longest span of 56 ft (17 m) and a deck 33 ft wide.

Who owns US15/US501NBL over SR1308?

It is owned by the State Highway Agency.