US Bridges

S-42-74 over Rainbow Lake

Good

Spartanburg County, South Carolina · 6.0 MI NE Inman · Structure no. 000000000008929

Built
1995
30 years old
Condition
Good
inspected September 2023
Type
Slab
Concrete Continuous
Length
74 ft
3 main spans
Daily traffic
1,400
2023 count
Owner
State
State Highway Agency

About this bridge

S-42-74 over Rainbow Lake is a concrete continuous slab carrying S-42-74 over Rainbow Lake in Spartanburg County, South Carolina. It was built in 1995, so it is 30 years old, younger than the South Carolina average of 48 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,400 vehicles a day, roughly 4% of them trucks, projected to reach 2,100 by 2043. The structure is 74 ft (22.6 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS-42-74
CrossesRainbow Lake
Location6.0 MI NE Inman
RouteState Highway 74
Coordinates35.09883, -81.99967
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating49.6 US tons
Inventory rating38.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length74 ft (22.6 m)
Longest span30 ft (9.1 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,400 (2023)
Projected traffic2,100 by 2043
Trucks4%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was S-42-74 over Rainbow Lake built?

It was built in 1995, making it 30 years old in 2025.

What condition is S-42-74 over Rainbow Lake in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does S-42-74 over Rainbow Lake carry?

About 1,400 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is S-42-74 over Rainbow Lake?

The structure is 74 ft (22.6 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.

Who owns S-42-74 over Rainbow Lake?

It is owned by the State Highway Agency.