US Bridges

L-2847/HRBRWATCHWY over Tidal Marsh

Fair

Charleston County, South Carolina · Harbour Watch Way · Structure no. 000000000010449

Built
1990
35 years old
Condition
Fair
inspected July 2023
Type
Tee Beam
Concrete
Length
74 ft
2 main spans
Daily traffic
600
2023 count
Owner
County
County Highway Agency

About this bridge

L-2847/HRBRWATCHWY over Tidal Marsh is a concrete tee beam carrying L-2847/HRBRWATCHWY over Tidal Marsh in Charleston County, South Carolina. It was built in 1990, so it is 35 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 600 vehicles a day, roughly 5% of them trucks, projected to reach 768 by 2043. The structure is 74 ft (22.6 m) long and 18 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesL-2847/HRBRWATCHWY
CrossesTidal Marsh
LocationHarbour Watch Way
RouteCounty Highway 2847
CountyCharleston County
StateSouth Carolina
Coordinates32.80981, -79.90147
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating63.2 US tons
Inventory rating37.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length74 ft (22.6 m)
Longest span37 ft (11.3 m)
Deck width18 ft (5.6 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic600 (2023)
Projected traffic768 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$303,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was L-2847/HRBRWATCHWY over Tidal Marsh built?

It was built in 1990, making it 35 years old in 2025.

What condition is L-2847/HRBRWATCHWY over Tidal Marsh 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-2847/HRBRWATCHWY over Tidal Marsh carry?

About 600 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is L-2847/HRBRWATCHWY over Tidal Marsh?

The structure is 74 ft (22.6 m) long with a longest span of 37 ft (11.3 m) and a deck 18 ft wide.

Who owns L-2847/HRBRWATCHWY over Tidal Marsh?

It is owned by the County Highway Agency.