US Bridges

S-45-16 over Johnsons Swamp

Good

Williamsburg County, South Carolina · 1.0 MI W. Andrews · Structure no. 000000000009548

Built
2000
25 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete Continuous
Length
150 ft
5 main spans
Daily traffic
1,500
2023 count
Owner
State
State Highway Agency

About this bridge

S-45-16 over Johnsons Swamp is a concrete continuous slab carrying S-45-16 over Johnsons Swamp in Williamsburg 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 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 1,500 vehicles a day, roughly 10% of them trucks, projected to reach 2,190 by 2043. The structure is 150 ft (45.7 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS-45-16
CrossesJohnsons Swamp
Location1.0 MI W. Andrews
RouteState Highway 16
CountyWilliamsburg County
StateSouth Carolina
Coordinates33.45861, -79.60333
Functional classRural Major Collector

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.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating44 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 (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,500 (2023)
Projected traffic2,190 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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-45-16 over Johnsons Swamp built?

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

What condition is S-45-16 over Johnsons Swamp 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 October 2023.

How much traffic does S-45-16 over Johnsons Swamp carry?

About 1,500 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is S-45-16 over Johnsons Swamp?

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-45-16 over Johnsons Swamp?

It is owned by the State Highway Agency.