US Bridges

Sc 41 over Back Swamp

Poor

Marion County, South Carolina · 4 MI NE of Rains · Structure no. 000000000000048

Built
1930
95 years old, rebuilt 1972
Condition
Poor
inspected June 2024
Type
Culvert
Concrete
Length
32 ft
3 main spans
Daily traffic
2,800
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 41 over Back Swamp is a concrete culvert carrying Sc 41 over Back Swamp in Marion County, South Carolina. It was built in 1930 and reconstructed in 1972, so it is 95 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 2,800 vehicles a day, roughly 12% of them trucks, projected to reach 4,452 by 2043. The structure is 32 ft (9.7 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSc 41
CrossesBack Swamp
Location4 MI NE of Rains
RouteState Highway 41
CountyMarion County
StateSouth Carolina
Coordinates34.13413, -79.26786
Functional classRural Minor Arterial

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating28.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 20
Structure length32 ft (9.7 m)
Longest span10 ft (3 m)
Deck width50 ft (15.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (2023)
Projected traffic4,452 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Sc 41 over Back Swamp built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1972.

What condition is Sc 41 over Back Swamp in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.

How much traffic does Sc 41 over Back Swamp carry?

About 2,800 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is Sc 41 over Back Swamp?

The structure is 32 ft (9.7 m) long with a longest span of 10 ft (3 m) and a deck 50 ft wide.

Who owns Sc 41 over Back Swamp?

It is owned by the State Highway Agency.