US Bridges

S-8-9 over Canterhill Swamp

Fair

Berkeley County, South Carolina · 6.5MI SW Moncks Corner · Structure no. 000000000007324

Built
1980
45 years old
Condition
Fair
inspected November 2024
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
6,600
2023 count
Owner
State
State Highway Agency

About this bridge

S-8-9 over Canterhill Swamp is a concrete slab carrying S-8-9 over Canterhill Swamp in Berkeley County, South Carolina. It was built in 1980, so it is 45 years old, younger 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 5 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 6,600 vehicles a day, roughly 6% of them trucks, projected to reach 8,580 by 2043. The structure is 45 ft (13.7 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesS-8-9
CrossesCanterhill Swamp
Location6.5MI SW Moncks Corner
RouteState Highway 9
CountyBerkeley County
StateSouth Carolina
Coordinates33.0884, -80.03873
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating28.9 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 15
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,600 (2023)
Projected traffic8,580 by 2043
Trucks6%
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 statusNot eligible for the National Register of Historic Places
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$183,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-8-9 over Canterhill Swamp built?

It was built in 1980, making it 45 years old in 2025.

What condition is S-8-9 over Canterhill 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 November 2024.

How much traffic does S-8-9 over Canterhill Swamp carry?

About 6,600 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is S-8-9 over Canterhill Swamp?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 33 ft wide.

Who owns S-8-9 over Canterhill Swamp?

It is owned by the State Highway Agency.