US Bridges

Sc 261 over Bosser Swamp

Fair

Georgetown County, South Carolina · 20 MI N Georgetown · Structure no. 000000000000864

Built
1938
87 years old
Condition
Fair
inspected December 2024
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
1,100
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 261 over Bosser Swamp is a concrete culvert carrying Sc 261 over Bosser Swamp in Georgetown County, South Carolina. It was built in 1938, so it is 87 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 1,100 vehicles a day, roughly 13% of them trucks, projected to reach 1,749 by 2043. The structure is 22 ft (6.7 m) long and 38 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSc 261
CrossesBosser Swamp
Location20 MI N Georgetown
RouteState Highway 261
CountyGeorgetown County
StateSouth Carolina
Coordinates33.68263, -79.32955
Functional classRural Minor 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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating36.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width38 ft (11.5 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2023)
Projected traffic1,749 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sc 261 over Bosser Swamp built?

It was built in 1938, making it 87 years old in 2025.

What condition is Sc 261 over Bosser 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 December 2024.

How much traffic does Sc 261 over Bosser Swamp carry?

About 1,100 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is Sc 261 over Bosser Swamp?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 38 ft wide.

Who owns Sc 261 over Bosser Swamp?

It is owned by the State Highway Agency.