US Bridges

US17S over Wolf Swamp

Fair

Onslow County, North Carolina · 0.2 MI N JCT SR1326 · Structure no. 000000001330034

Built
1965
60 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete Continuous
Length
37 ft
3 main spans
Daily traffic
14,000
2022 count
Owner
State
State Highway Agency

About this bridge

US17S over Wolf Swamp is a concrete continuous culvert carrying US17S over Wolf Swamp in Onslow County, North Carolina. It was built in 1965, so it is 60 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 14,000 vehicles a day, roughly 12% of them trucks, projected to reach 28,000 by 2040. The structure is 37 ft (11.2 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS17S
CrossesWolf Swamp
Location0.2 MI N JCT SR1326
RouteU.S. Route 17
CountyOnslow County
StateNorth Carolina
Coordinates34.79796, -77.36421
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length37 ft (11.2 m)
Longest span12 ft (3.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,000 (2022)
Projected traffic28,000 by 2040
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US17S over Wolf Swamp built?

It was built in 1965, making it 60 years old in 2025.

What condition is US17S over Wolf Swamp 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 February 2024.

How much traffic does US17S over Wolf Swamp carry?

About 14,000 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is US17S over Wolf Swamp?

The structure is 37 ft (11.2 m) long with a longest span of 12 ft (3.6 m).

Who owns US17S over Wolf Swamp?

It is owned by the State Highway Agency.