US Bridges

US 21 over Stream

Fair

York County, South Carolina · City of Rock Hill · Structure no. 000000000001409

Built
1947
78 years old, rebuilt 1974
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
21,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 21 over Stream is a concrete culvert carrying US 21 over Stream in York County, South Carolina. It was built in 1947 and reconstructed in 1974, so it is 78 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 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 21,000 vehicles a day, roughly 3% of them trucks, projected to reach 27,510 by 2043. The structure is 23 ft (7 m) long and 100 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 21
CrossesStream
LocationCity of Rock Hill
RouteU.S. Route 21
Coordinates34.9379, -80.99707
Functional classUrban Other Principal 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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating38.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width100 ft (30.5 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,000 (2023)
Projected traffic27,510 by 2043
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 US 21 over Stream built?

It was built in 1947, making it 78 years old in 2025. It was reconstructed in 1974.

What condition is US 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 June 2024.

How much traffic does US 21 over Stream carry?

About 21,000 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is US 21 over Stream?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m) and a deck 100 ft wide.

Who owns US 21 over Stream?

It is owned by the State Highway Agency.