US Bridges

S-15-21/SIDNEYS RD over Trib Edisto River

Good

Colleton County, South Carolina · 13.5 MI NE Walterboro · Structure no. 000000000009420

Built
1999
26 years old
Condition
Good
inspected March 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
4,100
2023 count
Owner
State
State Highway Agency

About this bridge

S-15-21/SIDNEYS RD over Trib Edisto River is a prestressed concrete box beam or girders - multiple carrying S-15-21/SIDNEYS RD over Trib Edisto River in Colleton County, South Carolina. It was built in 1999, so it is 26 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 4,100 vehicles a day, roughly 7% of them trucks, projected to reach 5,986 by 2043. The structure is 40 ft (12.2 m) long and 38 ft wide.

Location

Open in Google Maps
CarriesS-15-21/SIDNEYS RD
CrossesTrib Edisto River
Location13.5 MI NE Walterboro
RouteState Highway 21
CountyColleton County
StateSouth Carolina
Coordinates33.05519, -80.52179
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.3 US tons
Inventory rating48.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width38 ft (11.7 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,100 (2023)
Projected traffic5,986 by 2043
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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-15-21/SIDNEYS RD over Trib Edisto River built?

It was built in 1999, making it 26 years old in 2025.

What condition is S-15-21/SIDNEYS RD over Trib Edisto River 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 March 2023.

How much traffic does S-15-21/SIDNEYS RD over Trib Edisto River carry?

About 4,100 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is S-15-21/SIDNEYS RD over Trib Edisto River?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 38 ft wide.

Who owns S-15-21/SIDNEYS RD over Trib Edisto River?

It is owned by the State Highway Agency.