US Bridges

L-635/HYDE Park RD over Drayton Swamp

Fair

Charleston County, South Carolina · 5.0 MI NW Ravenel · Structure no. 000000000008979

Built
1996
29 years old
Condition
Fair
inspected July 2023
Type
Slab
Prestressed Concrete
Length
68 ft
2 main spans
Daily traffic
225
2023 count
Owner
County
County Highway Agency

About this bridge

L-635/HYDE Park RD over Drayton Swamp is a prestressed concrete slab carrying L-635/HYDE Park RD over Drayton Swamp in Charleston 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 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 225 vehicles a day, roughly 5% of them trucks, projected to reach 288 by 2043. The structure is 68 ft (20.7 m) long and 38 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

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CarriesL-635/HYDE Park RD
CrossesDrayton Swamp
Location5.0 MI NW Ravenel
RouteCounty Highway 635
CountyCharleston County
StateSouth Carolina
Coordinates32.82084, -80.28996
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 protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.1 US tons
Inventory rating38.9 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length68 ft (20.7 m)
Longest span34 ft (10.4 m)
Deck width38 ft (11.7 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2023)
Projected traffic288 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 L-635/HYDE Park RD over Drayton Swamp built?

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

What condition is L-635/HYDE Park RD over Drayton Swamp 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 July 2023.

How much traffic does L-635/HYDE Park RD over Drayton Swamp carry?

About 225 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is L-635/HYDE Park RD over Drayton Swamp?

The structure is 68 ft (20.7 m) long with a longest span of 34 ft (10.4 m) and a deck 38 ft wide.

Who owns L-635/HYDE Park RD over Drayton Swamp?

It is owned by the County Highway Agency.