US Bridges

S-40-31 over I-26

Fair

Richland County, South Carolina · 4 MI NW of Columbia · Structure no. 000000000007937

Built
1985
40 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
638 ft
4 main spans
Daily traffic
22,900
2023 count
Owner
State
State Highway Agency

About this bridge

S-40-31 over I-26 is a steel continuous stringer/multi-beam or girder carrying S-40-31 over I-26 in Richland County, South Carolina. It was built in 1985, so it is 40 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 22,900 vehicles a day, roughly 2% of them trucks, projected to reach 29,999 by 2043. The structure is 638 ft (194.6 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS-40-31
CrossesI-26
Location4 MI NW of Columbia
RouteState Highway 31
CountyRichland County
StateSouth Carolina
Coordinates34.03051, -81.10374
Functional classUrban 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.2 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length638 ft (194.6 m)
Longest span183 ft (55.8 m)
Deck width73 ft (22.4 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,900 (2023)
Projected traffic29,999 by 2043
Trucks2%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedWidening with deck rehabilitation or replacement
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was S-40-31 over I-26 built?

It was built in 1985, making it 40 years old in 2025.

What condition is S-40-31 over I-26 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 February 2023.

How much traffic does S-40-31 over I-26 carry?

About 22,900 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is S-40-31 over I-26?

The structure is 638 ft (194.6 m) long with a longest span of 183 ft (55.8 m) and a deck 73 ft wide.

Who owns S-40-31 over I-26?

It is owned by the State Highway Agency.