US Bridges

NC4 NC48 over Black Swamp

Good

Nash County, North Carolina · 0.2 Mi.S. of SR1514 · Structure no. 000000001270316

Built
1991
34 years old
Condition
Good
inspected June 2024
Type
Culvert
Concrete Continuous
Length
28 ft
3 main spans
Daily traffic
1,700
2021 count
Owner
State
State Highway Agency

About this bridge

NC4 NC48 over Black Swamp is a concrete continuous culvert carrying NC4 NC48 over Black Swamp in Nash County, North Carolina. It was built in 1991, so it is 34 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,700 vehicles a day, roughly 7% of them trucks, projected to reach 3,400 by 2040. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 5 mi (8 km).

CarriesNC4 NC48
CrossesBlack Swamp
Location0.2 Mi.S. of SR1514
RouteState Highway 4
Coordinates36.10581, -77.81383
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
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 spans3
Design loadHS 20 + Mod
Structure length28 ft (8.5 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2021)
Projected traffic3,400 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 NC4 NC48 over Black Swamp built?

It was built in 1991, making it 34 years old in 2025.

What condition is NC4 NC48 over Black 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 June 2024.

How much traffic does NC4 NC48 over Black Swamp carry?

About 1,700 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is NC4 NC48 over Black Swamp?

The structure is 28 ft (8.5 m) long with a longest span of 9 ft (2.7 m).

Who owns NC4 NC48 over Black Swamp?

It is owned by the State Highway Agency.