US Bridges

S-40-985 over Trib to Forest Lake

FairPosted for load

Richland County, South Carolina · 2 MI E of Forest Acres · Structure no. 000000000005375

Built
1968
57 years old
Condition
Fair
inspected January 2023
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
1,100
2023 count
Owner
State
State Highway Agency

About this bridge

S-40-985 over Trib to Forest Lake is a concrete slab carrying S-40-985 over Trib to Forest Lake in Richland County, South Carolina. It was built in 1968, so it is 57 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 1,100 vehicles a day, roughly 3% of them trucks, projected to reach 1,408 by 2043. The structure is 45 ft (13.7 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesS-40-985
CrossesTrib to Forest Lake
Location2 MI E of Forest Acres
RouteState Highway 985
CountyRichland County
StateSouth Carolina
Coordinates34.02532, -80.95182
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
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
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.6 US tons
Inventory rating20.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, precast panels
Main spans3
Design loadH 10
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width28 ft (8.4 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,100 (2023)
Projected traffic1,408 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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$161,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was S-40-985 over Trib to Forest Lake built?

It was built in 1968, making it 57 years old in 2025.

What condition is S-40-985 over Trib to Forest Lake 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 January 2023.

How much traffic does S-40-985 over Trib to Forest Lake carry?

About 1,100 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is S-40-985 over Trib to Forest Lake?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 28 ft wide.

Who owns S-40-985 over Trib to Forest Lake?

It is owned by the State Highway Agency.