US Bridges

US 17 Alt over Edisto River

Fair

Dorchester County, South Carolina · 14MI S Sumrvl · Structure no. 000000000006087

Built
1972
53 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
791 ft
3 main spans
Daily traffic
11,600
2023 count
Owner
State
State Highway Agency

About this bridge

US 17 Alt over Edisto River is a steel continuous stringer/multi-beam or girder carrying US 17 Alt over Edisto River in Dorchester 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 11,600 vehicles a day, roughly 10% of them trucks, projected to reach 18,444 by 2043. The structure is 791 ft (241.1 m) long and 53 ft wide.

Location

Open in Google Maps
CarriesUS 17 Alt
CrossesEdisto River
Location14MI S Sumrvl
RouteU.S. Route 17
CountyDorchester County
StateSouth Carolina
Coordinates32.92691, -80.3983
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 alignment8: Equal to present desirable criteria
Operating rating54.7 US tons
Inventory rating32.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+25 approach)
Design loadHS 20
Structure length791 ft (241.1 m)
Longest span60 ft (18.3 m)
Deck width53 ft (16.2 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,600 (2023)
Projected traffic18,444 by 2043
Trucks10%
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 built?

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

What condition is US 17 Alt over Edisto River 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 US 17 Alt over Edisto River carry?

About 11,600 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is US 17 Alt over Edisto River?

The structure is 791 ft (241.1 m) long with a longest span of 60 ft (18.3 m) and a deck 53 ft wide.

Who owns US 17 Alt over Edisto River?

It is owned by the State Highway Agency.