US Bridges

S-20-12 over Trib to Parr Reservoir

Good

Fairfield County, South Carolina · 17.5MI W Winnsboro · Structure no. 000000000004313

Built
2009
16 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
150 ft
2 main spans
Daily traffic
425
2023 count
Owner
State
State Highway Agency

About this bridge

S-20-12 over Trib to Parr Reservoir is a prestressed concrete continuous stringer/multi-beam or girder carrying S-20-12 over Trib to Parr Reservoir in Fairfield 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 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 425 vehicles a day, roughly 5% of them trucks, projected to reach 544 by 2043. The structure is 150 ft (45.7 m) long and 37 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesS-20-12
CrossesTrib to Parr Reservoir
Location17.5MI W Winnsboro
RouteState Highway 12
Coordinates34.40193, -81.39365
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
Deck8 Very GoodNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating34.6 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length150 ft (45.7 m)
Longest span100 ft (30.5 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic425 (2023)
Projected traffic544 by 2043
Trucks5%
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

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-20-12 over Trib to Parr Reservoir built?

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

What condition is S-20-12 over Trib to Parr Reservoir 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 2023.

How much traffic does S-20-12 over Trib to Parr Reservoir carry?

About 425 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-20-12 over Trib to Parr Reservoir?

The structure is 150 ft (45.7 m) long with a longest span of 100 ft (30.5 m) and a deck 37 ft wide.

Who owns S-20-12 over Trib to Parr Reservoir?

It is owned by the State Highway Agency.