US Bridges

US17N over Wolf Swamp

Good

Onslow County, North Carolina · 0.2 MI N JCT SR1326 · Structure no. 000000001330033

Built
2023
2 years old
Condition
Good
inspected January 2024
Type
Slab
Prestressed Concrete
Length
100 ft
1 main span
Daily traffic
7,000
2022 count
Owner
State
State Highway Agency

About this bridge

US17N over Wolf Swamp is a prestressed concrete slab carrying US17N over Wolf Swamp in Onslow County, North Carolina. It was built in 2023, so it is 2 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 good condition with a lowest component rating of 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,000 vehicles a day, roughly 12% of them trucks, projected to reach 14,000 by 2040. The structure is 100 ft (30.4 m) long and 40 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS17N
CrossesWolf Swamp
Location0.2 MI N JCT SR1326
RouteU.S. Route 17
CountyOnslow County
StateNorth Carolina
Coordinates34.79781, -77.36405
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.9 US tons
Inventory rating60 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHL 93
Structure length100 ft (30.4 m)
Longest span97 ft (29.5 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,000 (2022)
Projected traffic14,000 by 2040
Trucks12%
Lanes on structure2
Traffic directionTwo-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 US17N over Wolf Swamp built?

It was built in 2023, making it 2 years old in 2025.

What condition is US17N over Wolf Swamp in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2024.

How much traffic does US17N over Wolf Swamp carry?

About 7,000 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is US17N over Wolf Swamp?

The structure is 100 ft (30.4 m) long with a longest span of 97 ft (29.5 m) and a deck 40 ft wide.

Who owns US17N over Wolf Swamp?

It is owned by the State Highway Agency.