US Bridges

L-990 over Lousing Swamp

Good

Horry County, South Carolina · 6 MI N of Aynor · Structure no. 000000000010904

Built
2023
2 years old
Condition
Good
inspected April 2024
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
250
2023 count
Owner
County
County Highway Agency

About this bridge

L-990 over Lousing Swamp is a concrete culvert carrying L-990 over Lousing Swamp in Horry County, South Carolina. It was built in 2023, so it is 2 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 250 vehicles a day, projected to reach 320 by 2043. The structure is 27 ft (8.1 m) long and 43 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesL-990
CrossesLousing Swamp
Location6 MI N of Aynor
RouteCounty Highway 990
CountyHorry County
StateSouth Carolina
Coordinates34.0402, -79.17456
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour evaluation has not been made
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating47.5 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length27 ft (8.1 m)
Longest span12 ft (3.7 m)
Deck width43 ft (13 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deck100 ft (30.5 m)

Traffic and service

Average daily traffic250 (2023)
Projected traffic320 by 2043
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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-990 over Lousing Swamp built?

It was built in 2023, making it 2 years old in 2025.

What condition is L-990 over Lousing Swamp 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 April 2024.

How much traffic does L-990 over Lousing Swamp carry?

About 250 vehicles per day (2023 count).

How long is L-990 over Lousing Swamp?

The structure is 27 ft (8.1 m) long with a longest span of 12 ft (3.7 m) and a deck 43 ft wide.

Who owns L-990 over Lousing Swamp?

It is owned by the County Highway Agency.