US Bridges

S-11-21 over Stream

Fair

Cherokee County, South Carolina · 3.4 MI NE Blacksburg · Structure no. 000000000000719

Built
1942
83 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
700
2023 count
Owner
State
State Highway Agency

About this bridge

S-11-21 over Stream is a concrete culvert carrying S-11-21 over Stream in Cherokee County, South Carolina. It was built in 1942, so it is 83 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 700 vehicles a day, roughly 18% of them trucks, projected to reach 1,022 by 2025. The structure is 27 ft (8.2 m) long and 60 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesS-11-21
CrossesStream
Location3.4 MI NE Blacksburg
RouteState Highway 21
Coordinates35.14083, -81.45917
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 20
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width60 ft (18.3 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic700 (2023)
Projected traffic1,022 by 2025
Trucks18%
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 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 S-11-21 over Stream built?

It was built in 1942, making it 83 years old in 2025.

What condition is S-11-21 over Stream 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 2025.

How much traffic does S-11-21 over Stream carry?

About 700 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is S-11-21 over Stream?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m) and a deck 60 ft wide.

Who owns S-11-21 over Stream?

It is owned by the State Highway Agency.