US Bridges

I-85 SB over S-79

Fair

Spartanburg County, South Carolina · 4.5 MI NW of Spartanburg · Structure no. 000000000008674

Built
1993
32 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
183 ft
3 main spans
Daily traffic
42,450
2023 count
Owner
State
State Highway Agency

About this bridge

I-85 SB over S-79 is a steel stringer/multi-beam or girder carrying I-85 SB over S-79 in Spartanburg County, South Carolina. It was built in 1993, so it is 32 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 6 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 42,450 vehicles a day, roughly 20% of them trucks, projected to reach 53,063 by 2043. The structure is 183 ft (55.7 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-85 SB
CrossesS-79
Location4.5 MI NW of Spartanburg
RouteInterstate 85
Coordinates35.01256, -81.97562
Functional classUrban Principal Arterial - Interstate

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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
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 rating46.4 US tons
Inventory rating35.7 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length183 ft (55.7 m)
Longest span102 ft (31.1 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,450 (2023)
Projected traffic53,063 by 2043
Trucks20%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-85 SB over S-79 built?

It was built in 1993, making it 32 years old in 2025.

What condition is I-85 SB over S-79 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 2023.

How much traffic does I-85 SB over S-79 carry?

About 42,450 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I-85 SB over S-79?

The structure is 183 ft (55.7 m) long with a longest span of 102 ft (31.1 m) and a deck 63 ft wide.

Who owns I-85 SB over S-79?

It is owned by the State Highway Agency.