US Bridges

US 301 over Black Swamp (no. 4)

Good

Clarendon County, South Carolina · 8MI N of Manning · Structure no. 000000000001940

Built
2017
8 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
140 ft
3 main spans
Daily traffic
1,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 301 over Black Swamp (no. 4) is a prestressed concrete box beam or girders - multiple carrying US 301 over Black Swamp (no. 4) in Clarendon County, South Carolina. It was built in 2017, so it is 8 years old, younger than the South Carolina average of 48 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 1,700 vehicles a day, roughly 10% of them trucks, projected to reach 2,482 by 2043. The structure is 140 ft (42.7 m) long and 42 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesUS 301
CrossesBlack Swamp (no. 4)
Location8MI N of Manning
RouteU.S. Route 301
CountyClarendon County
StateSouth Carolina
Coordinates33.81707, -80.10734
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating53.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHL 93
Structure length140 ft (42.7 m)
Longest span60 ft (18.3 m)
Deck width42 ft (12.8 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,700 (2023)
Projected traffic2,482 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 US 301 over Black Swamp (no. 4) built?

It was built in 2017, making it 8 years old in 2025.

What condition is US 301 over Black Swamp (no. 4) 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 September 2023.

How much traffic does US 301 over Black Swamp (no. 4) carry?

About 1,700 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is US 301 over Black Swamp (no. 4)?

The structure is 140 ft (42.7 m) long with a longest span of 60 ft (18.3 m) and a deck 42 ft wide.

Who owns US 301 over Black Swamp (no. 4)?

It is owned by the State Highway Agency.