US Bridges

S-15-41/RITTER RD over Calfpen Swamp

Fair

Colleton County, South Carolina · 9.5 MI SW Walterboro · Structure no. 000000000001943

Built
1953
72 years old, rebuilt 2002
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
28 ft
2 main spans
Daily traffic
850
2023 count
Owner
State
State Highway Agency

About this bridge

S-15-41/RITTER RD over Calfpen Swamp is a concrete slab carrying S-15-41/RITTER RD over Calfpen Swamp in Colleton County, South Carolina. It was built in 1953 and reconstructed in 2002, so it is 72 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 850 vehicles a day, roughly 13% of them trucks, projected to reach 1,241 by 2043. The structure is 28 ft (8.5 m) long and 26 ft wide. If it were closed, the detour would be 21.1 mi (34 km).

Location

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CarriesS-15-41/RITTER RD
CrossesCalfpen Swamp
Location9.5 MI SW Walterboro
RouteState Highway 41
CountyColleton County
StateSouth Carolina
Coordinates32.77096, -80.70579
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating37.5 US tons
Inventory rating22.5 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadH 10
Structure length28 ft (8.5 m)
Longest span14 ft (4.3 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2023)
Projected traffic1,241 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 S-15-41/RITTER RD over Calfpen Swamp built?

It was built in 1953, making it 72 years old in 2025. It was reconstructed in 2002.

What condition is S-15-41/RITTER RD over Calfpen 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 January 2025.

How much traffic does S-15-41/RITTER RD over Calfpen Swamp carry?

About 850 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is S-15-41/RITTER RD over Calfpen Swamp?

The structure is 28 ft (8.5 m) long with a longest span of 14 ft (4.3 m) and a deck 26 ft wide.

Who owns S-15-41/RITTER RD over Calfpen Swamp?

It is owned by the State Highway Agency.