US Bridges

Sc 170 over Little Back River

Fair

Jasper County, South Carolina · Ga/Sc LN · Structure no. 000000000001061

Built
1925
100 years old, rebuilt 1953
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
1,987 ft
1 main span
Daily traffic
3,800
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 170 over Little Back River is a steel stringer/multi-beam or girder carrying Sc 170 over Little Back River in Jasper County, South Carolina. It was built in 1925 and reconstructed in 1953, so it is 100 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.

It carries about 3,800 vehicles a day, roughly 30% of them trucks, projected to reach 4,256 by 2043. The structure is 1,987 ft (605.6 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesSc 170
CrossesLittle Back River
LocationGa/Sc LN
RouteState Highway 170
CountyJasper County
StateSouth Carolina
Coordinates32.16586, -81.12961
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.7 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, precast panels
Main spans1 (+76 approach)
Design loadH 15
Structure length1,987 ft (605.6 m)
Longest span49 ft (14.9 m)
Deck width31 ft (9.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,800 (2023)
Projected traffic4,256 by 2043
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Sc 170 over Little Back River built?

It was built in 1925, making it 100 years old in 2025. It was reconstructed in 1953.

What condition is Sc 170 over Little Back River 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 September 2023.

How much traffic does Sc 170 over Little Back River carry?

About 3,800 vehicles per day (2023 count), of which roughly 30% are trucks.

How long is Sc 170 over Little Back River?

The structure is 1,987 ft (605.6 m) long with a longest span of 49 ft (14.9 m) and a deck 31 ft wide.

Who owns Sc 170 over Little Back River?

It is owned by the State Highway Agency.