US Bridges

Sc 9 SB over I-77

Fair

Chester County, South Carolina · 10.6MI NE of Chester · Structure no. 000000000007083

Built
1978
47 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
304 ft
4 main spans
Daily traffic
6,500
2023 count
Owner
State
State Highway Agency

About this bridge

Sc 9 SB over I-77 is a steel continuous stringer/multi-beam or girder carrying Sc 9 SB over I-77 in Chester County, South Carolina. It was built in 1978, so it is 47 years old, younger 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 6,500 vehicles a day, roughly 14% of them trucks, projected to reach 11,310 by 2043. The structure is 304 ft (92.7 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesSc 9 SB
CrossesI-77
Location10.6MI NE of Chester
RouteState Highway 9
CountyChester County
StateSouth Carolina
Coordinates34.74552, -81.0356
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.1 US tons
Inventory rating57.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length304 ft (92.7 m)
Longest span109 ft (33.2 m)
Deck width43 ft (13 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,500 (2023)
Projected traffic11,310 by 2043
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sc 9 SB over I-77 built?

It was built in 1978, making it 47 years old in 2025.

What condition is Sc 9 SB over I-77 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 March 2024.

How much traffic does Sc 9 SB over I-77 carry?

About 6,500 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Sc 9 SB over I-77?

The structure is 304 ft (92.7 m) long with a longest span of 109 ft (33.2 m) and a deck 43 ft wide.

Who owns Sc 9 SB over I-77?

It is owned by the State Highway Agency.