US Bridges

S-23-318 over Dam at Lake Lanier

PoorPosted for load

Greenville County, South Carolina · 17.5 MI N Greer · Structure no. 000000000000183

Built
1925
100 years old, rebuilt 1980
Condition
Poor
inspected May 2023
Type
Tee Beam
Concrete
Length
130 ft
5 main spans
Daily traffic
75
2023 count
Owner
State
State Highway Agency

About this bridge

S-23-318 over Dam at Lake Lanier is a concrete tee beam carrying S-23-318 over Dam at Lake Lanier in Greenville County, South Carolina. It was built in 1925 and reconstructed in 1980, so it is 100 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 75 vehicles a day, projected to reach 96 by 2043. The structure is 130 ft (39.5 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesS-23-318
CrossesDam at Lake Lanier
Location17.5 MI N Greer
RouteState Highway 318
Coordinates35.19686, -82.23534
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating19.3 US tons
Inventory rating11.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans5
Design loadH 10
Structure length130 ft (39.5 m)
Longest span26 ft (7.9 m)
Deck width21 ft (6.4 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2023)
Projected traffic96 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$578,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-23-318 over Dam at Lake Lanier built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1980.

What condition is S-23-318 over Dam at Lake Lanier in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.

How much traffic does S-23-318 over Dam at Lake Lanier carry?

About 75 vehicles per day (2023 count).

How long is S-23-318 over Dam at Lake Lanier?

The structure is 130 ft (39.5 m) long with a longest span of 26 ft (7.9 m) and a deck 21 ft wide.

Who owns S-23-318 over Dam at Lake Lanier?

It is owned by the State Highway Agency.