US Bridges

S-21-730 over Lynches Lake

Good

Florence County, South Carolina · 3 MI SE Lake City · Structure no. 000000000009010

Built
1996
29 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete Continuous
Length
150 ft
5 main spans
Daily traffic
300
2023 count
Owner
State
State Highway Agency

About this bridge

S-21-730 over Lynches Lake is a concrete continuous slab carrying S-21-730 over Lynches Lake in Florence County, South Carolina. It was built in 1996, so it is 29 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 300 vehicles a day, roughly 5% of them trucks, projected to reach 384 by 2043. The structure is 150 ft (45.7 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesS-21-730
CrossesLynches Lake
Location3 MI SE Lake City
RouteState Highway 730
Coordinates33.85583, -79.69504
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51 US tons
Inventory rating39.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length150 ft (45.7 m)
Longest span30 ft (9.1 m)
Deck width37 ft (11.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2023)
Projected traffic384 by 2043
Trucks5%
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 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-21-730 over Lynches Lake built?

It was built in 1996, making it 29 years old in 2025.

What condition is S-21-730 over Lynches Lake 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 April 2023.

How much traffic does S-21-730 over Lynches Lake carry?

About 300 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-21-730 over Lynches Lake?

The structure is 150 ft (45.7 m) long with a longest span of 30 ft (9.1 m) and a deck 37 ft wide.

Who owns S-21-730 over Lynches Lake?

It is owned by the State Highway Agency.