US Bridges

S-45-574 over Br of Flat CR

Good

Williamsburg County, South Carolina · 4.0 MI S Trio · Structure no. 000000000009379

Built
1998
27 years old
Condition
Good
inspected October 2023
Type
Slab
Concrete
Length
33 ft
1 main span
Daily traffic
175
2023 count
Owner
State
State Highway Agency

About this bridge

S-45-574 over Br of Flat CR is a concrete slab carrying S-45-574 over Br of Flat CR in Williamsburg County, South Carolina. It was built in 1998, so it is 27 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 175 vehicles a day, roughly 9% of them trucks, projected to reach 243 by 2043. The structure is 33 ft (10.1 m) long and 36 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesS-45-574
CrossesBr of Flat CR
Location4.0 MI S Trio
RouteState Highway 574
Coordinates33.46, -79.68889
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating48.2 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadHS 25 or greater
Structure length33 ft (10.1 m)
Longest span33 ft (10.1 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2023)
Projected traffic243 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-45-574 over Br of Flat CR built?

It was built in 1998, making it 27 years old in 2025.

What condition is S-45-574 over Br of Flat CR 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 2023.

How much traffic does S-45-574 over Br of Flat CR carry?

About 175 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is S-45-574 over Br of Flat CR?

The structure is 33 ft (10.1 m) long with a longest span of 33 ft (10.1 m) and a deck 36 ft wide.

Who owns S-45-574 over Br of Flat CR?

It is owned by the State Highway Agency.