US Bridges

S-4-29 over I-85

Fair

Anderson County, South Carolina · 6.3MI N Anderson · Structure no. 000000000003796

Built
1962
63 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
295 ft
5 main spans
Daily traffic
5,000
2023 count
Owner
State
State Highway Agency

About this bridge

S-4-29 over I-85 is a prestressed concrete stringer/multi-beam or girder carrying S-4-29 over I-85 in Anderson County, South Carolina. It was built in 1962, so it is 63 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 5,000 vehicles a day, roughly 5% of them trucks, projected to reach 6,150 by 2043. The structure is 295 ft (89.9 m) long and 30 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesS-4-29
CrossesI-85
Location6.3MI N Anderson
RouteState Highway 29
CountyAnderson County
StateSouth Carolina
Coordinates34.59633, -82.66193
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating51.5 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 15
Structure length295 ft (89.9 m)
Longest span65 ft (19.8 m)
Deck width30 ft (9.2 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2023)
Projected traffic6,150 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 proposedWidening with deck rehabilitation or replacement
Estimated improvement cost$818,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was S-4-29 over I-85 built?

It was built in 1962, making it 63 years old in 2025.

What condition is S-4-29 over I-85 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 December 2024.

How much traffic does S-4-29 over I-85 carry?

About 5,000 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-4-29 over I-85?

The structure is 295 ft (89.9 m) long with a longest span of 65 ft (19.8 m) and a deck 30 ft wide.

Who owns S-4-29 over I-85?

It is owned by the State Highway Agency.