US Bridges

L-2771/HERIOT ST over Tidal Creek

GoodClosed to traffic

Charleston County, South Carolina · In Charleston · Structure no. 000000000010518

Built
2009
16 years old
Condition
Good
inspected August 2023
Type
Slab
Concrete Continuous
Length
1,440 ft
48 main spans
Daily traffic
600
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

L-2771/HERIOT ST over Tidal Creek is a concrete continuous slab carrying L-2771/HERIOT ST over Tidal Creek in Charleston County, South Carolina. It was built in 2009, so it is 16 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. Its operating status is: closed to all traffic.

It carries about 600 vehicles a day, roughly 5% of them trucks, projected to reach 768 by 2043. The structure is 1,440 ft (438.9 m) long and 39 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesL-2771/HERIOT ST
CrossesTidal Creek
LocationIn Charleston
RouteCounty Highway 2771
Coordinates32.81778, -79.9575
Functional classUrban Local

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 protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment0: Immediate repair necessary to put back in service
Operating rating47.8 US tons
Inventory rating36.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans48
Design loadHL 93
Structure length1,440 ft (438.9 m)
Longest span30 ft (9.1 m)
Deck width39 ft (11.9 m)
Roadway width26 ft (7.9 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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$3 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was L-2771/HERIOT ST over Tidal Creek built?

It was built in 2009, making it 16 years old in 2025.

What condition is L-2771/HERIOT ST over Tidal Creek 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 August 2023.

How much traffic does L-2771/HERIOT ST over Tidal Creek carry?

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

How long is L-2771/HERIOT ST over Tidal Creek?

The structure is 1,440 ft (438.9 m) long with a longest span of 30 ft (9.1 m) and a deck 39 ft wide.

Who owns L-2771/HERIOT ST over Tidal Creek?

It is owned by the City or Municipal Highway Agency.