US Bridges

US 17 Alt over Edisto River Swp (1)

Fair

Colleton County, South Carolina · 2.5 MI SE of Cottageville · Structure no. 000000000005916

Built
1971
54 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete Continuous
Length
75 ft
3 main spans
Daily traffic
8,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 17 Alt over Edisto River Swp (1) is a concrete continuous slab carrying US 17 Alt over Edisto River Swp (1) in Colleton County, South Carolina. It was built in 1971, so it is 54 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 8,000 vehicles a day, roughly 12% of them trucks, projected to reach 12,720 by 2043. The structure is 75 ft (22.9 m) long and 47 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesUS 17 Alt
CrossesEdisto River Swp (1)
Location2.5 MI SE of Cottageville
RouteU.S. Route 17
Coordinates32.925, -80.42917
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.
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 rating51.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span25 ft (7.6 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,000 (2023)
Projected traffic12,720 by 2043
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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 statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 17 Alt over Edisto River Swp (1) built?

It was built in 1971, making it 54 years old in 2025.

What condition is US 17 Alt over Edisto River Swp (1) 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 (1) carry?

About 8,000 vehicles per day (2023 count), of which roughly 12% are trucks.

How long is US 17 Alt over Edisto River Swp (1)?

The structure is 75 ft (22.9 m) long with a longest span of 25 ft (7.6 m) and a deck 47 ft wide.

Who owns US 17 Alt over Edisto River Swp (1)?

It is owned by the State Highway Agency.