US Bridges

NC906 over Middle Swamp

Good

Brunswick County, North Carolina · 0.7 MI S JCT US17BUS · Structure no. 000000000190104

Built
2023
2 years old
Condition
Good
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
165 ft
2 main spans
Daily traffic
7,100
2022 count
Owner
State
State Highway Agency

About this bridge

NC906 over Middle Swamp is a prestressed concrete stringer/multi-beam or girder carrying NC906 over Middle Swamp in Brunswick 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 7,100 vehicles a day, roughly 7% of them trucks, projected to reach 14,200 by 2040. The structure is 165 ft (50.2 m) long and 43 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

CarriesNC906
CrossesMiddle Swamp
Location0.7 MI S JCT US17BUS
RouteState Highway 906
Coordinates34.05198, -78.15313
Functional classRural Major Collector

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: 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 rating92.9 US tons
Inventory rating70 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length165 ft (50.2 m)
Longest span83 ft (25.2 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,100 (2022)
Projected traffic14,200 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 km)
TollOn a free road
National Highway SystemNo

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 NC906 over Middle Swamp built?

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

What condition is NC906 over Middle 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 November 2023.

How much traffic does NC906 over Middle Swamp carry?

About 7,100 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is NC906 over Middle Swamp?

The structure is 165 ft (50.2 m) long with a longest span of 83 ft (25.2 m) and a deck 43 ft wide.

Who owns NC906 over Middle Swamp?

It is owned by the State Highway Agency.