US Bridges

US13 US64 over Back Swamp Branch

Fair

Martin County, North Carolina · .4 Mi. E. of Jct. SR1001 · Structure no. 000000001170267

Built
1999
26 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
10,000
2022 count
Owner
State
State Highway Agency

About this bridge

US13 US64 over Back Swamp Branch is a concrete continuous culvert carrying US13 US64 over Back Swamp Branch in Martin County, North Carolina. It was built in 1999, so it is 26 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 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 10,000 vehicles a day, roughly 14% of them trucks, projected to reach 20,000 by 2040. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS13 US64
CrossesBack Swamp Branch
Location.4 Mi. E. of Jct. SR1001
RouteU.S. Route 13
CountyMartin County
StateNorth Carolina
Coordinates35.81829, -77.07181
Functional classRural Principal Arterial - Other

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 protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 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 rating62.9 US tons
Inventory rating48.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.4 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 traffic10,000 (2022)
Projected traffic20,000 by 2040
Trucks14%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US13 US64 over Back Swamp Branch built?

It was built in 1999, making it 26 years old in 2025.

What condition is US13 US64 over Back Swamp Branch 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 June 2024.

How much traffic does US13 US64 over Back Swamp Branch carry?

About 10,000 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is US13 US64 over Back Swamp Branch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns US13 US64 over Back Swamp Branch?

It is owned by the State Highway Agency.