US Bridges

I-20 over Black Creek

Good

Lexington County, South Carolina · 3MI SE of Gilbert · Structure no. 000000000005798

Built
1970
55 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
22 ft
2 main spans
Daily traffic
40,200
2023 count
Owner
State
State Highway Agency

About this bridge

I-20 over Black Creek is a concrete culvert carrying I-20 over Black Creek in Lexington County, South Carolina. It was built in 1970, so it is 55 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 40,200 vehicles a day, roughly 20% of them trucks, projected to reach 64,320 by 2043. The structure is 22 ft (6.6 m) long and 150 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesI-20
CrossesBlack Creek
Location3MI SE of Gilbert
RouteInterstate 20
Coordinates33.89152, -81.35819
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.4 US tons
Inventory rating66.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length22 ft (6.6 m)
Longest span10 ft (3 m)
Deck width150 ft (45.7 m)
Roadway width138 ft (42.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic40,200 (2023)
Projected traffic64,320 by 2043
Trucks20%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Black Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is I-20 over Black Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does I-20 over Black Creek carry?

About 40,200 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I-20 over Black Creek?

The structure is 22 ft (6.6 m) long with a longest span of 10 ft (3 m) and a deck 150 ft wide.

Who owns I-20 over Black Creek?

It is owned by the State Highway Agency.