US Bridges

US 301 over Maple Swamp

Fair

Dillon County, South Carolina · 1.0MI SE of Dillon · Structure no. 000000000005023

Built
1967
58 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
7,800
2023 count
Owner
State
State Highway Agency

About this bridge

US 301 over Maple Swamp is a concrete continuous culvert carrying US 301 over Maple Swamp in Dillon County, South Carolina. It was built in 1967, so it is 58 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 7,800 vehicles a day, roughly 10% of them trucks, projected to reach 12,168 by 2043. The structure is 32 ft (9.7 m) long and 74 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 301
CrossesMaple Swamp
Location1.0MI SE of Dillon
RouteU.S. Route 301
CountyDillon County
StateSouth Carolina
Coordinates34.39839, -79.38139
Functional classUrban Other Principal 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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating28.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 15
Structure length32 ft (9.7 m)
Longest span10 ft (3 m)
Deck width74 ft (22.6 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,800 (2023)
Projected traffic12,168 by 2043
Trucks10%
Lanes on structure4
Traffic directionTwo-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 301 over Maple Swamp built?

It was built in 1967, making it 58 years old in 2025.

What condition is US 301 over Maple 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 February 2024.

How much traffic does US 301 over Maple Swamp carry?

About 7,800 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is US 301 over Maple Swamp?

The structure is 32 ft (9.7 m) long with a longest span of 10 ft (3 m) and a deck 74 ft wide.

Who owns US 301 over Maple Swamp?

It is owned by the State Highway Agency.