US Bridges

S-29-99 over Flat Creek

Fair

Lancaster County, South Carolina · 9MI NE Kershaw · Structure no. 000000000000204

Built
1925
100 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
84 ft
2 main spans
Daily traffic
125
2023 count
Owner
State
State Highway Agency

About this bridge

S-29-99 over Flat Creek is a concrete tee beam carrying S-29-99 over Flat Creek in Lancaster County, South Carolina. It was built in 1925, so it is 100 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 125 vehicles a day, roughly 5% of them trucks, projected to reach 160 by 2043. The structure is 84 ft (25.6 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesS-29-99
CrossesFlat Creek
Location9MI NE Kershaw
RouteState Highway 99
CountyLancaster County
StateSouth Carolina
Coordinates34.63521, -80.4639
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
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 alignment6: Equal to present minimum criteria
Operating rating47.5 US tons
Inventory rating36.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 10
Structure length84 ft (25.6 m)
Longest span42 ft (12.8 m)
Deck width21 ft (6.3 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2023)
Projected traffic160 by 2043
Trucks5%
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$207,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-29-99 over Flat Creek built?

It was built in 1925, making it 100 years old in 2025.

What condition is S-29-99 over Flat 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 August 2023.

How much traffic does S-29-99 over Flat Creek carry?

About 125 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-29-99 over Flat Creek?

The structure is 84 ft (25.6 m) long with a longest span of 42 ft (12.8 m) and a deck 21 ft wide.

Who owns S-29-99 over Flat Creek?

It is owned by the State Highway Agency.