US Bridges

S-9-72 over Halfway Swamp

Fair

Calhoun County, South Carolina · 10 MI SW ST Mathews · Structure no. 000000000007203

Built
1979
46 years old
Condition
Fair
inspected July 2023
Type
Channel Beam
Prestressed Concrete
Length
120 ft
4 main spans
Daily traffic
75
2023 count
Owner
State
State Highway Agency

About this bridge

S-9-72 over Halfway Swamp is a prestressed concrete channel beam carrying S-9-72 over Halfway Swamp in Calhoun County, South Carolina. It was built in 1979, so it is 46 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 75 vehicles a day, projected to reach 96 by 2043. The structure is 120 ft (36.6 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesS-9-72
CrossesHalfway Swamp
Location10 MI SW ST Mathews
RouteState Highway 72
CountyCalhoun County
StateSouth Carolina
Coordinates33.58991, -80.61091
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans4
Design loadH 15
Structure length120 ft (36.6 m)
Longest span30 ft (9.1 m)
Deck width33 ft (10.2 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2023)
Projected traffic96 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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-9-72 over Halfway Swamp built?

It was built in 1979, making it 46 years old in 2025.

What condition is S-9-72 over Halfway 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 July 2023.

How much traffic does S-9-72 over Halfway Swamp carry?

About 75 vehicles per day (2023 count).

How long is S-9-72 over Halfway Swamp?

The structure is 120 ft (36.6 m) long with a longest span of 30 ft (9.1 m) and a deck 33 ft wide.

Who owns S-9-72 over Halfway Swamp?

It is owned by the State Highway Agency.