US Bridges

Sc 183 over Lake Keowee

Fair

Oconee County, South Carolina · 9.0 MI N of Seneca · Structure no. 000000000005591

Built
1969
56 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
587 ft
7 main spans
Daily traffic
6,400
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 183 over Lake Keowee is a steel stringer/multi-beam or girder carrying Sc 183 over Lake Keowee in Oconee County, South Carolina. It was built in 1969, so it is 56 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 6,400 vehicles a day, roughly 10% of them trucks, projected to reach 10,176 by 2043. The structure is 587 ft (178.9 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesSc 183
CrossesLake Keowee
Location9.0 MI N of Seneca
RouteState Highway 183
CountyOconee County
StateSouth Carolina
Coordinates34.81132, -82.92228
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
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 inspectionApril 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.6 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length587 ft (178.9 m)
Longest span84 ft (25.6 m)
Deck width36 ft (11.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,400 (2023)
Projected traffic10,176 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Sc 183 over Lake Keowee built?

It was built in 1969, making it 56 years old in 2025.

What condition is Sc 183 over Lake Keowee 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 April 2023.

How much traffic does Sc 183 over Lake Keowee carry?

About 6,400 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Sc 183 over Lake Keowee?

The structure is 587 ft (178.9 m) long with a longest span of 84 ft (25.6 m) and a deck 36 ft wide.

Who owns Sc 183 over Lake Keowee?

It is owned by the State Highway Agency.