US Bridges

S-16-355 over I-20

Fair

Darlington County, South Carolina · 4MI NE Lamar · Structure no. 000000000006469

Built
1974
51 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
254 ft
4 main spans
Daily traffic
100
2023 count
Owner
State
State Highway Agency

About this bridge

S-16-355 over I-20 is a steel stringer/multi-beam or girder carrying S-16-355 over I-20 in Darlington County, South Carolina. It was built in 1974, so it is 51 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 100 vehicles a day, roughly 5% of them trucks, projected to reach 128 by 2043. The structure is 254 ft (77.4 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesS-16-355
CrossesI-20
Location4MI NE Lamar
RouteState Highway 355
CountyDarlington County
StateSouth Carolina
Coordinates34.20583, -79.99953
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.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.1 US tons
Inventory rating43.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length254 ft (77.4 m)
Longest span90 ft (27.4 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic128 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was S-16-355 over I-20 built?

It was built in 1974, making it 51 years old in 2025.

What condition is S-16-355 over I-20 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 January 2025.

How much traffic does S-16-355 over I-20 carry?

About 100 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-16-355 over I-20?

The structure is 254 ft (77.4 m) long with a longest span of 90 ft (27.4 m) and a deck 37 ft wide.

Who owns S-16-355 over I-20?

It is owned by the State Highway Agency.