US Bridges

S-20-70 over Lake ( Mill Creek)

Good

Fairfield County, South Carolina · 4.4 MI SW of Winnsboro · Structure no. 000000000009657

Built
2002
23 years old
Condition
Good
inspected April 2023
Type
Slab
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
1,150
2023 count
Owner
State
State Highway Agency

About this bridge

S-20-70 over Lake ( Mill Creek) is a prestressed concrete slab carrying S-20-70 over Lake ( Mill Creek) in Fairfield 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 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 1,150 vehicles a day, roughly 3% of them trucks, projected to reach 1,679 by 2043. The structure is 60 ft (18.3 m) long and 36 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesS-20-70
CrossesLake ( Mill Creek)
Location4.4 MI SW of Winnsboro
RouteState Highway 70
Coordinates34.33108, -81.13765
Functional classRural Major 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating44.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length60 ft (18.3 m)
Longest span60 ft (18.3 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,150 (2023)
Projected traffic1,679 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-20-70 over Lake ( Mill Creek) built?

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

What condition is S-20-70 over Lake ( Mill Creek) 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-20-70 over Lake ( Mill Creek) carry?

About 1,150 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is S-20-70 over Lake ( Mill Creek)?

The structure is 60 ft (18.3 m) long with a longest span of 60 ft (18.3 m) and a deck 36 ft wide.

Who owns S-20-70 over Lake ( Mill Creek)?

It is owned by the State Highway Agency.