US Bridges

US421 Sbl over South Deep Creek

Fair

Yadkin County, North Carolina · 1.2 MI.N.JCT.SR1141 · Structure no. 000000001970219

Built
2001
24 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
354 ft
3 main spans
Daily traffic
9,500
2021 count
Owner
State
State Highway Agency

About this bridge

US421 Sbl over South Deep Creek is a steel stringer/multi-beam or girder carrying US421 Sbl over South Deep Creek in Yadkin County, North Carolina. It was built in 2001, so it is 24 years old, younger than the North Carolina average of 38.7 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 9,500 vehicles a day, roughly 14% of them trucks, projected to reach 18,000 by 2040. The structure is 354 ft (107.9 m) long and 40 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesUS421 Sbl
CrossesSouth Deep Creek
Location1.2 MI.N.JCT.SR1141
RouteU.S. Route 421
Coordinates36.11831, -80.72289
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating86 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length354 ft (107.9 m)
Longest span128 ft (39 m)
Deck width40 ft (12.3 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,500 (2021)
Projected traffic18,000 by 2040
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes

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 US421 Sbl over South Deep Creek built?

It was built in 2001, making it 24 years old in 2025.

What condition is US421 Sbl over South Deep Creek 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 May 2023.

How much traffic does US421 Sbl over South Deep Creek carry?

About 9,500 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is US421 Sbl over South Deep Creek?

The structure is 354 ft (107.9 m) long with a longest span of 128 ft (39 m) and a deck 40 ft wide.

Who owns US421 Sbl over South Deep Creek?

It is owned by the State Highway Agency.