US Bridges

S-4-23 over Lake Hartwell

Fair

Anderson County, South Carolina · 14.7MI W Anderson · Structure no. 000000000001162

Built
1941
84 years old, rebuilt 1965
Condition
Fair
inspected January 2025
Type
Slab
Concrete
Length
225 ft
15 main spans
Daily traffic
450
2023 count
Owner
State
State Highway Agency

About this bridge

S-4-23 over Lake Hartwell is a concrete slab carrying S-4-23 over Lake Hartwell in Anderson County, South Carolina. It was built in 1941 and reconstructed in 1965, so it is 84 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 5 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 450 vehicles a day, roughly 9% of them trucks, projected to reach 657 by 2043. The structure is 225 ft (68.6 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesS-4-23
CrossesLake Hartwell
Location14.7MI W Anderson
RouteState Highway 23
CountyAnderson County
StateSouth Carolina
Coordinates34.50029, -82.9209
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans15
Design loadH 10
Structure length225 ft (68.6 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2023)
Projected traffic657 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
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 S-4-23 over Lake Hartwell built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1965.

What condition is S-4-23 over Lake Hartwell 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 2025.

How much traffic does S-4-23 over Lake Hartwell carry?

About 450 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is S-4-23 over Lake Hartwell?

The structure is 225 ft (68.6 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-4-23 over Lake Hartwell?

It is owned by the State Highway Agency.