US Bridges

US 301 NB over Four Hole Swamp

Good

Orangeburg County, South Carolina · 8 MI W of Santee · Structure no. 000000000010805

Built
2024
1 years old
Condition
Good
inspected July 2024
Type
Slab
Concrete
Length
300 ft
8 main spans
Daily traffic
4,900
2023 count
Owner
State
State Highway Agency

About this bridge

US 301 NB over Four Hole Swamp is a concrete slab carrying US 301 NB over Four Hole Swamp in Orangeburg County, South Carolina. It was built in 2024, so it is 1 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 4,900 vehicles a day, roughly 17% of them trucks, projected to reach 8,526 by 2043. The structure is 300 ft (91.4 m) long and 46 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesUS 301 NB
CrossesFour Hole Swamp
Location8 MI W of Santee
RouteU.S. Route 301
Coordinates33.45733, -80.6477
Functional classRural Principal Arterial - Other

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 protection9 ExcellentNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating45.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans8
Design loadHL 93
Structure length300 ft (91.4 m)
Longest span40 ft (12.2 m)
Deck width46 ft (14.1 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic4,900 (2023)
Projected traffic8,526 by 2043
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 US 301 NB over Four Hole Swamp built?

It was built in 2024, making it 1 years old in 2025.

What condition is US 301 NB over Four Hole 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 July 2024.

How much traffic does US 301 NB over Four Hole Swamp carry?

About 4,900 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is US 301 NB over Four Hole Swamp?

The structure is 300 ft (91.4 m) long with a longest span of 40 ft (12.2 m) and a deck 46 ft wide.

Who owns US 301 NB over Four Hole Swamp?

It is owned by the State Highway Agency.