US Bridges

Sc 31 SB over Sc 90

Good

Horry County, South Carolina · 22.55 MI NE of Socastee · Structure no. 000000000009788

Built
2002
23 years old
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
221 ft
3 main spans
Daily traffic
17,600
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 31 SB over Sc 90 is a prestressed concrete stringer/multi-beam or girder carrying Sc 31 SB over Sc 90 in Horry County, South Carolina. It was built in 2002, so it is 23 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 17,600 vehicles a day, roughly 5% of them trucks, projected to reach 50,864 by 2043. The structure is 221 ft (67.4 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSc 31 SB
CrossesSc 90
Location22.55 MI NE of Socastee
RouteState Highway 31
Coordinates33.85229, -78.69832
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating47.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length221 ft (67.4 m)
Longest span100 ft (30.5 m)
Deck width59 ft (18 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,600 (2023)
Projected traffic50,864 by 2043
Trucks5%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sc 31 SB over Sc 90 built?

It was built in 2002, making it 23 years old in 2025.

What condition is Sc 31 SB over Sc 90 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 October 2024.

How much traffic does Sc 31 SB over Sc 90 carry?

About 17,600 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Sc 31 SB over Sc 90?

The structure is 221 ft (67.4 m) long with a longest span of 100 ft (30.5 m) and a deck 59 ft wide.

Who owns Sc 31 SB over Sc 90?

It is owned by the State Highway Agency.