US Bridges

Sc 61 over Marsh

Fair

Charleston County, South Carolina · Charleston · Structure no. 000000000008975

Built
1995
30 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
1,890 ft
63 main spans
Daily traffic
21,000
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 61 over Marsh is a concrete continuous slab carrying Sc 61 over Marsh in Charleston County, South Carolina. It was built in 1995, so it is 30 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 21,000 vehicles a day, roughly 3% of them trucks, projected to reach 57,540 by 2043. The structure is 1,890 ft (576.1 m) long and 57 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSc 61
CrossesMarsh
LocationCharleston
RouteState Highway 61
CountyCharleston County
StateSouth Carolina
Coordinates32.7761, -79.96054
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 protection9 ExcellentNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating42.1 US tons
Inventory rating32.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans63
Design loadHS 20 + Mod
Structure length1,890 ft (576.1 m)
Longest span30 ft (9.1 m)
Deck width57 ft (17.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deck15 ft (4.7 m)

Traffic and service

Average daily traffic21,000 (2023)
Projected traffic57,540 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

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 Sc 61 over Marsh built?

It was built in 1995, making it 30 years old in 2025.

What condition is Sc 61 over Marsh 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 February 2024.

How much traffic does Sc 61 over Marsh carry?

About 21,000 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Sc 61 over Marsh?

The structure is 1,890 ft (576.1 m) long with a longest span of 30 ft (9.1 m) and a deck 57 ft wide.

Who owns Sc 61 over Marsh?

It is owned by the State Highway Agency.