US Bridges

S-21-29 over Jefferies Creek

Fair

Florence County, South Carolina · At Cashua ST - Florence · Structure no. 000000000004316

Built
1921
104 years old, rebuilt 1964
Condition
Fair
inspected April 2023
Type
Slab
Concrete
Length
130 ft
6 main spans
Daily traffic
12,800
2023 count
Owner
State
State Highway Agency

About this bridge

S-21-29 over Jefferies Creek is a concrete slab carrying S-21-29 over Jefferies Creek in Florence County, South Carolina. It was built in 1921 and reconstructed in 1964, so it is 104 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 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 12,800 vehicles a day, roughly 2% of them trucks, projected to reach 8,576 by 2043. The structure is 130 ft (39.6 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesS-21-29
CrossesJefferies Creek
LocationAt Cashua ST - Florence
RouteState Highway 29
Coordinates34.17814, -79.80932
Functional classUrban 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
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating52.1 US tons
Inventory rating31.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length130 ft (39.6 m)
Longest span25 ft (7.6 m)
Deck width36 ft (10.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,800 (2023)
Projected traffic8,576 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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$332,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-21-29 over Jefferies Creek built?

It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1964.

What condition is S-21-29 over Jefferies Creek 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 April 2023.

How much traffic does S-21-29 over Jefferies Creek carry?

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

How long is S-21-29 over Jefferies Creek?

The structure is 130 ft (39.6 m) long with a longest span of 25 ft (7.6 m) and a deck 36 ft wide.

Who owns S-21-29 over Jefferies Creek?

It is owned by the State Highway Agency.