US Bridges

L-2123/NATIONAL DR over Tidal Creek

Good

Charleston County, South Carolina · In Mt Pleasant · Structure no. 000000000010478

Built
1988
37 years old
Condition
Good
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
34 ft
1 main span
Daily traffic
225
2023 count
Owner
County
County Highway Agency

About this bridge

L-2123/NATIONAL DR over Tidal Creek is a prestressed concrete box beam or girders - multiple carrying L-2123/NATIONAL DR over Tidal Creek in Charleston County, South Carolina. It was built in 1988, so it is 37 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 225 vehicles a day, roughly 4% of them trucks, projected to reach 288 by 2043. The structure is 34 ft (10.4 m) long and 28 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesL-2123/NATIONAL DR
CrossesTidal Creek
LocationIn Mt Pleasant
RouteCounty Highway 2123
Coordinates32.86417, -79.76722
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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating55 US tons
Inventory rating30 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 15
Structure length34 ft (10.4 m)
Longest span34 ft (10.4 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic225 (2023)
Projected traffic288 by 2043
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$86,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was L-2123/NATIONAL DR over Tidal Creek built?

It was built in 1988, making it 37 years old in 2025.

What condition is L-2123/NATIONAL DR 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 July 2023.

How much traffic does L-2123/NATIONAL DR over Tidal Creek carry?

About 225 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is L-2123/NATIONAL DR over Tidal Creek?

The structure is 34 ft (10.4 m) long with a longest span of 34 ft (10.4 m) and a deck 28 ft wide.

Who owns L-2123/NATIONAL DR over Tidal Creek?

It is owned by the County Highway Agency.