US Bridges

US21 over South Yadkin River

Good

Iredell County, North Carolina · 0.5 Mi. N. Jct. SR1914 · Structure no. 000000000970074

Built
1993
32 years old
Condition
Good
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
262 ft
4 main spans
Daily traffic
3,100
2021 count
Owner
State
State Highway Agency

About this bridge

US21 over South Yadkin River is a prestressed concrete stringer/multi-beam or girder carrying US21 over South Yadkin River in Iredell County, North Carolina. It was built in 1993, so it is 32 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 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 3,100 vehicles a day, roughly 7% of them trucks, projected to reach 6,200 by 2040. The structure is 262 ft (79.8 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesUS21
CrossesSouth Yadkin River
Location0.5 Mi. N. Jct. SR1914
RouteU.S. Route 21
Coordinates35.88495, -80.82312
Functional classRural Major Collector

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 inspectionAugust 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating53.9 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length262 ft (79.8 m)
Longest span63 ft (19.2 m)
Deck width33 ft (10 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2021)
Projected traffic6,200 by 2040
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 US21 over South Yadkin River built?

It was built in 1993, making it 32 years old in 2025.

What condition is US21 over South Yadkin River 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 August 2024.

How much traffic does US21 over South Yadkin River carry?

About 3,100 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is US21 over South Yadkin River?

The structure is 262 ft (79.8 m) long with a longest span of 63 ft (19.2 m) and a deck 33 ft wide.

Who owns US21 over South Yadkin River?

It is owned by the State Highway Agency.