US Bridges

S-21-49 over Lynches Lake

Fair

Florence County, South Carolina · 1.5 MI S Prospect · Structure no. 000000000009501

Built
2000
25 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
105 ft
7 main spans
Daily traffic
400
2023 count
Owner
State
State Highway Agency

About this bridge

S-21-49 over Lynches Lake is a concrete slab carrying S-21-49 over Lynches Lake in Florence County, South Carolina. It was built in 2000, so it is 25 years old, younger 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 6 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 400 vehicles a day, roughly 9% of them trucks, projected to reach 556 by 2043. The structure is 105 ft (32 m) long and 28 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesS-21-49
CrossesLynches Lake
Location1.5 MI S Prospect
RouteState Highway 49
Coordinates33.82472, -79.5575
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.2 US tons
Inventory rating19.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans7
Design loadH 10
Structure length105 ft (32 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic556 by 2043
Trucks9%
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-21-49 over Lynches Lake built?

It was built in 2000, making it 25 years old in 2025.

What condition is S-21-49 over Lynches Lake 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 2024.

How much traffic does S-21-49 over Lynches Lake carry?

About 400 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is S-21-49 over Lynches Lake?

The structure is 105 ft (32 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-21-49 over Lynches Lake?

It is owned by the State Highway Agency.