US Bridges

I-95 NB over Great Swamp

Fair

Colleton County, South Carolina · 2.0 MI W of Waltbr · Structure no. 000000000006062

Built
1972
53 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete
Length
300 ft
10 main spans
Daily traffic
24,700
2023 count
Owner
State
State Highway Agency

About this bridge

I-95 NB over Great Swamp is a concrete slab carrying I-95 NB over Great Swamp in Colleton County, South Carolina. It was built in 1972, so it is 53 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 24,700 vehicles a day, roughly 22% of them trucks, projected to reach 43,225 by 2043. The structure is 300 ft (91.4 m) long and 43 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesI-95 NB
CrossesGreat Swamp
Location2.0 MI W of Waltbr
RouteInterstate 95
CountyColleton County
StateSouth Carolina
Coordinates32.90562, -80.70244
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.2 US tons
Inventory rating44.6 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20
Structure length300 ft (91.4 m)
Longest span30 ft (9.1 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,700 (2023)
Projected traffic43,225 by 2043
Trucks22%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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-95 NB over Great Swamp built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-95 NB over Great Swamp 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 2024.

How much traffic does I-95 NB over Great Swamp carry?

About 24,700 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is I-95 NB over Great Swamp?

The structure is 300 ft (91.4 m) long with a longest span of 30 ft (9.1 m) and a deck 43 ft wide.

Who owns I-95 NB over Great Swamp?

It is owned by the State Highway Agency.