US Bridges

US64A over Flat Swamp

Fair

Martin County, North Carolina · 0.05 Mi. W. Jct. SR1161 · Structure no. 000000001170001

Built
1958
67 years old
Condition
Fair
inspected April 2024
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
1,400
2022 count
Owner
State
State Highway Agency

About this bridge

US64A over Flat Swamp is a concrete continuous culvert carrying US64A over Flat Swamp in Martin County, North Carolina. It was built in 1958, so it is 67 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 1,400 vehicles a day, roughly 7% of them trucks, projected to reach 2,800 by 2040. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS64A
CrossesFlat Swamp
Location0.05 Mi. W. Jct. SR1161
RouteU.S. Route 64
CountyMartin County
StateNorth Carolina
Coordinates35.82367, -77.29127
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 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 spans2
Design loadHS 20 + Mod
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2022)
Projected traffic2,800 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 US64A over Flat Swamp built?

It was built in 1958, making it 67 years old in 2025.

What condition is US64A over Flat 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 April 2024.

How much traffic does US64A over Flat Swamp carry?

About 1,400 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is US64A over Flat Swamp?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns US64A over Flat Swamp?

It is owned by the State Highway Agency.