US Bridges

US 17 Alt over Edisto River Swp (3)

Fair

Colleton County, South Carolina · 4.5 MI SE of Cottageville · Structure no. 000000000006072

Built
1972
53 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete Continuous
Length
500 ft
20 main spans
Daily traffic
9,800
2023 count
Owner
State
State Highway Agency

About this bridge

US 17 Alt over Edisto River Swp (3) is a concrete continuous slab carrying US 17 Alt over Edisto River Swp (3) 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 9,800 vehicles a day, roughly 17% of them trucks, projected to reach 15,582 by 2043. The structure is 500 ft (152.4 m) long and 53 ft wide.

CarriesUS 17 Alt
CrossesEdisto River Swp (3)
Location4.5 MI SE of Cottageville
RouteU.S. Route 17
Coordinates32.92647, -80.40483
Functional classRural 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.
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 geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54.2 US tons
Inventory rating41.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans20
Design loadHS 20
Structure length500 ft (152.4 m)
Longest span25 ft (7.6 m)
Deck width53 ft (16.2 m)
Roadway width49 ft (15 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,800 (2023)
Projected traffic15,582 by 2043
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 17 Alt over Edisto River Swp (3) built?

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

What condition is US 17 Alt over Edisto River Swp (3) 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 US 17 Alt over Edisto River Swp (3) carry?

About 9,800 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is US 17 Alt over Edisto River Swp (3)?

The structure is 500 ft (152.4 m) long with a longest span of 25 ft (7.6 m) and a deck 53 ft wide.

Who owns US 17 Alt over Edisto River Swp (3)?

It is owned by the State Highway Agency.