US Bridges

US421 Nbl over SR1710

Fair

Yadkin County, North Carolina · .2 MI.S.JCT.SR1146 · Structure no. 000000001970082

Built
1960
65 years old, rebuilt 1991
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
153 ft
3 main spans
Daily traffic
10,250
2021 count
Owner
State
State Highway Agency

About this bridge

US421 Nbl over SR1710 is a steel stringer/multi-beam or girder carrying US421 Nbl over SR1710 in Yadkin County, North Carolina. It was built in 1960 and reconstructed in 1991, so it is 65 years old, older 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 10,250 vehicles a day, roughly 14% of them trucks, projected to reach 20,500 by 2040. The structure is 153 ft (46.6 m) long and 31 ft wide.

Location

Open in Google Maps
CarriesUS421 Nbl
CrossesSR1710
Location.2 MI.S.JCT.SR1146
RouteU.S. Route 421
CountyYadkin County
StateNorth Carolina
Coordinates36.11374, -80.58844
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.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.9 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length153 ft (46.6 m)
Longest span51 ft (15.5 m)
Deck width31 ft (9.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,250 (2021)
Projected traffic20,500 by 2040
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US421 Nbl over SR1710 built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 1991.

What condition is US421 Nbl over SR1710 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 2023.

How much traffic does US421 Nbl over SR1710 carry?

About 10,250 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is US421 Nbl over SR1710?

The structure is 153 ft (46.6 m) long with a longest span of 51 ft (15.5 m) and a deck 31 ft wide.

Who owns US421 Nbl over SR1710?

It is owned by the State Highway Agency.