US Bridges

S-40-1597 over Eightmile Branch

FairPosted for load

Richland County, South Carolina · 4 MI NW of Columbia · Structure no. 000000000006184

Built
1972
53 years old
Condition
Fair
inspected December 2024
Type
Slab
Concrete
Length
30 ft
2 main spans
Daily traffic
750
2023 count
Owner
State
State Highway Agency

About this bridge

S-40-1597 over Eightmile Branch is a concrete slab carrying S-40-1597 over Eightmile Branch in Richland County, South Carolina. It was built in 1972, so it is 53 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. Its operating status is: posted for load restriction.

It carries about 750 vehicles a day, roughly 5% of them trucks, projected to reach 960 by 2043. The structure is 30 ft (9.1 m) long and 33 ft wide.

Location

Open in Google Maps
CarriesS-40-1597
CrossesEightmile Branch
Location4 MI NW of Columbia
RouteState Highway 1597
CountyRichland County
StateSouth Carolina
Coordinates34.04098, -80.98561
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.2 US tons
Inventory rating16.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans2
Design loadH 10
Structure length30 ft (9.1 m)
Longest span15 ft (4.6 m)
Deck width33 ft (10 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2023)
Projected traffic960 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-40-1597 over Eightmile Branch built?

It was built in 1972, making it 53 years old in 2025.

What condition is S-40-1597 over Eightmile Branch 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-40-1597 over Eightmile Branch carry?

About 750 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is S-40-1597 over Eightmile Branch?

The structure is 30 ft (9.1 m) long with a longest span of 15 ft (4.6 m) and a deck 33 ft wide.

Who owns S-40-1597 over Eightmile Branch?

It is owned by the State Highway Agency.