US Bridges

US 17 SB over Sc 30/S-658

Fair

Charleston County, South Carolina · City of Charleston · Structure no. 000000000009138

Built
1997
28 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
925 ft
5 main spans
Daily traffic
38,250
2023 count
Owner
State
State Highway Agency

About this bridge

US 17 SB over Sc 30/S-658 is a steel continuous stringer/multi-beam or girder carrying US 17 SB over Sc 30/S-658 in Charleston County, South Carolina. It was built in 1997, so it is 28 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 38,250 vehicles a day, roughly 2% of them trucks, projected to reach 54,698 by 2043. The structure is 925 ft (281.9 m) long and 44 ft wide.

CarriesUS 17 SB
CrossesSc 30/S-658
LocationCity of Charleston
RouteU.S. Route 17
Coordinates32.78538, -79.95641
Functional classUrban Other Principal 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.3 US tons
Inventory rating37.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5 (+3 approach)
Design loadHS 20 + Mod
Structure length925 ft (281.9 m)
Longest span127 ft (38.7 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,250 (2023)
Projected traffic54,698 by 2043
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate STRAHNET route

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 17 SB over Sc 30/S-658 built?

It was built in 1997, making it 28 years old in 2025.

What condition is US 17 SB over Sc 30/S-658 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 June 2024.

How much traffic does US 17 SB over Sc 30/S-658 carry?

About 38,250 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is US 17 SB over Sc 30/S-658?

The structure is 925 ft (281.9 m) long with a longest span of 127 ft (38.7 m) and a deck 44 ft wide.

Who owns US 17 SB over Sc 30/S-658?

It is owned by the State Highway Agency.