US Bridges

NC561 over Marsh Swamp

Fair

Halifax County, North Carolina · 0.5 MI E. of JCT SR1001 · Structure no. 000000000830076

Built
1975
50 years old
Condition
Fair
inspected June 2023
Type
Slab
Prestressed Concrete
Length
91 ft
3 main spans
Daily traffic
1,000
2021 count
Owner
State
State Highway Agency

About this bridge

NC561 over Marsh Swamp is a prestressed concrete slab carrying NC561 over Marsh Swamp in Halifax County, North Carolina. It was built in 1975, so it is 50 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 1,000 vehicles a day, roughly 8% of them trucks, projected to reach 2,000 by 2040. The structure is 91 ft (27.7 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNC561
CrossesMarsh Swamp
Location0.5 MI E. of JCT SR1001
RouteState Highway 561
CountyHalifax County
StateNorth Carolina
Coordinates36.30209, -77.6605
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 15
Structure length91 ft (27.7 m)
Longest span29 ft (8.8 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2021)
Projected traffic2,000 by 2040
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was NC561 over Marsh Swamp built?

It was built in 1975, making it 50 years old in 2025.

What condition is NC561 over Marsh 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 June 2023.

How much traffic does NC561 over Marsh Swamp carry?

About 1,000 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is NC561 over Marsh Swamp?

The structure is 91 ft (27.7 m) long with a longest span of 29 ft (8.8 m) and a deck 30 ft wide.

Who owns NC561 over Marsh Swamp?

It is owned by the State Highway Agency.