US Bridges

S-23-318 over Trib Lake Lanier

Good

Greenville County, South Carolina · 16.5 MI N Greer · Structure no. 000000000009190

Built
1997
28 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
79 ft
1 main span
Daily traffic
100
2023 count
Owner
State
State Highway Agency

About this bridge

S-23-318 over Trib Lake Lanier is a prestressed concrete stringer/multi-beam or girder carrying S-23-318 over Trib Lake Lanier in Greenville 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 5% of them trucks, projected to reach 128 by 2043. The structure is 79 ft (24.1 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesS-23-318
CrossesTrib Lake Lanier
Location16.5 MI N Greer
RouteState Highway 318
Coordinates35.18126, -82.24138
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 23 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.1 US tons
Inventory rating52.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length79 ft (24.1 m)
Longest span79 ft (24.1 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic128 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-23-318 over Trib Lake Lanier built?

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

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

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

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

About 100 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-23-318 over Trib Lake Lanier?

The structure is 79 ft (24.1 m) long with a longest span of 79 ft (24.1 m) and a deck 36 ft wide.

Who owns S-23-318 over Trib Lake Lanier?

It is owned by the State Highway Agency.