US Bridges

S-10-20/MAIN RD over RR CSXT & L-1376 &S-1377

Fair

Charleston County, South Carolina · 9.8 MI W Charleston · Structure no. 000000000007331

Built
1980
45 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
405 ft
6 main spans
Daily traffic
28,400
2023 count
Owner
State
State Highway Agency

About this bridge

S-10-20/MAIN RD over RR CSXT & L-1376 &S-1377 is a steel stringer/multi-beam or girder carrying S-10-20/MAIN RD over RR CSXT & L-1376 &S-1377 in Charleston County, South Carolina. It was built in 1980, so it is 45 years old, younger 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 28,400 vehicles a day, roughly 7% of them trucks, projected to reach 34,648 by 2043. The structure is 405 ft (123.4 m) long and 47 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

CarriesS-10-20/MAIN RD
CrossesRR CSXT & L-1376 &S-1377
Location9.8 MI W Charleston
RouteState Highway 20
Coordinates32.79274, -80.10793
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.6 US tons
Inventory rating52.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length405 ft (123.4 m)
Longest span80 ft (24.4 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,400 (2023)
Projected traffic34,648 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed16.8 mi (27 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-10-20/MAIN RD over RR CSXT & L-1376 &S-1377 built?

It was built in 1980, making it 45 years old in 2025.

What condition is S-10-20/MAIN RD over RR CSXT & L-1376 &S-1377 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 June 2023.

How much traffic does S-10-20/MAIN RD over RR CSXT & L-1376 &S-1377 carry?

About 28,400 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S-10-20/MAIN RD over RR CSXT & L-1376 &S-1377?

The structure is 405 ft (123.4 m) long with a longest span of 80 ft (24.4 m) and a deck 47 ft wide.

Who owns S-10-20/MAIN RD over RR CSXT & L-1376 &S-1377?

It is owned by the State Highway Agency.