US Bridges

S-20-151 over Br of Thorntree CR

FairPosted for load

Fairfield County, South Carolina · 14MI SE Winnsboro · Structure no. 000000000003648

Built
1961
64 years old
Condition
Fair
inspected May 2024
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
850
2023 count
Owner
State
State Highway Agency

About this bridge

S-20-151 over Br of Thorntree CR is a concrete slab carrying S-20-151 over Br of Thorntree CR in Fairfield County, South Carolina. It was built in 1961, so it is 64 years old, older than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 850 vehicles a day, roughly 10% of them trucks, projected to reach 1,241 by 2043. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesS-20-151
CrossesBr of Thorntree CR
Location14MI SE Winnsboro
RouteState Highway 151
CountyFairfield County
StateSouth Carolina
Coordinates34.33306, -80.84694
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.3 US tons
Inventory rating14.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 10
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2023)
Projected traffic1,241 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$312,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-20-151 over Br of Thorntree CR built?

It was built in 1961, making it 64 years old in 2025.

What condition is S-20-151 over Br of Thorntree CR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does S-20-151 over Br of Thorntree CR carry?

About 850 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is S-20-151 over Br of Thorntree CR?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-20-151 over Br of Thorntree CR?

It is owned by the State Highway Agency.