US Bridges

I-20 over Gillies Ditch

Fair

Kershaw County, South Carolina · 5 MI W of Camden · Structure no. 000000000005561

Built
1969
56 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
44,200
2023 count
Owner
State
State Highway Agency

About this bridge

I-20 over Gillies Ditch is a concrete culvert carrying I-20 over Gillies Ditch in Kershaw County, South Carolina. It was built in 1969, so it is 56 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 44,200 vehicles a day, roughly 16% of them trucks, projected to reach 70,720 by 2043. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-20
CrossesGillies Ditch
Location5 MI W of Camden
RouteInterstate 20
CountyKershaw County
StateSouth Carolina
Coordinates34.19353, -80.67632
Functional classRural Principal Arterial - Interstate

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 protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.1 US tons
Inventory rating51.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic44,200 (2023)
Projected traffic70,720 by 2043
Trucks16%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-20 over Gillies Ditch built?

It was built in 1969, making it 56 years old in 2025.

What condition is I-20 over Gillies Ditch 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 May 2024.

How much traffic does I-20 over Gillies Ditch carry?

About 44,200 vehicles per day (2023 count), of which roughly 16% are trucks.

How long is I-20 over Gillies Ditch?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns I-20 over Gillies Ditch?

It is owned by the State Highway Agency.