US Bridges

S-66/COMBAHEE RD over Trib to Combahee River

Fair

Colleton County, South Carolina · 13.3 MI SW Walterboro · Structure no. 000000000004492

Built
1965
60 years old
Condition
Fair
inspected February 2025
Type
Slab
Concrete
Length
30 ft
2 main spans
Daily traffic
100
2023 count
Owner
State
State Highway Agency

About this bridge

S-66/COMBAHEE RD over Trib to Combahee River is a concrete slab carrying S-66/COMBAHEE RD over Trib to Combahee River in Colleton County, South Carolina. It was built in 1965, so it is 60 years old, older 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 100 vehicles a day, projected to reach 128 by 2043. The structure is 30 ft (9.1 m) long and 28 ft wide. If it were closed, the detour would be 39.1 mi (63 km).

Location

Open in Google Maps
CarriesS-66/COMBAHEE RD
CrossesTrib to Combahee River
Location13.3 MI SW Walterboro
RouteState Highway 66
CountyColleton County
StateSouth Carolina
Coordinates32.68636, -80.71955
Functional classRural Local

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 protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadH 15
Structure length30 ft (9.1 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic128 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed39.1 mi (63 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-66/COMBAHEE RD over Trib to Combahee River built?

It was built in 1965, making it 60 years old in 2025.

What condition is S-66/COMBAHEE RD over Trib to Combahee River 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 February 2025.

How much traffic does S-66/COMBAHEE RD over Trib to Combahee River carry?

About 100 vehicles per day (2023 count).

How long is S-66/COMBAHEE RD over Trib to Combahee River?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-66/COMBAHEE RD over Trib to Combahee River?

It is owned by the State Highway Agency.