US Bridges

I-85 Nbl over Seneca River

Fair

Anderson County, South Carolina · 10.2MI NW of Anderson · Structure no. 000000000004018

Built
1963
62 years old, rebuilt 1983
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,130 ft
5 main spans
Daily traffic
24,850
2023 count
Owner
State
State Highway Agency

About this bridge

I-85 Nbl over Seneca River is a steel continuous stringer/multi-beam or girder carrying I-85 Nbl over Seneca River in Anderson County, South Carolina. It was built in 1963 and reconstructed in 1983, so it is 62 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 24,850 vehicles a day, roughly 25% of them trucks. The structure is 1,130 ft (344.4 m) long and 47 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesI-85 Nbl
CrossesSeneca River
Location10.2MI NW of Anderson
RouteInterstate 85
CountyAnderson County
StateSouth Carolina
Coordinates34.53771, -82.8227
Functional classRural 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29.7 US tons
Inventory rating22.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5 (+7 approach)
Design loadH 20
Structure length1,130 ft (344.4 m)
Longest span140 ft (42.7 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,850 (2023)
Projected traffic—
Trucks25%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-85 Nbl over Seneca River built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1983.

What condition is I-85 Nbl over Seneca 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 December 2024.

How much traffic does I-85 Nbl over Seneca River carry?

About 24,850 vehicles per day (2023 count), of which roughly 25% are trucks.

How long is I-85 Nbl over Seneca River?

The structure is 1,130 ft (344.4 m) long with a longest span of 140 ft (42.7 m) and a deck 47 ft wide.

Who owns I-85 Nbl over Seneca River?

It is owned by the State Highway Agency.