US Bridges

US421 over Fish Dam Creek

Fair

Wilkes County, North Carolina · .5 MI.W.JCT.NC16 · Structure no. 000000001930058

Built
1955
70 years old, rebuilt 2004
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
35 ft
3 main spans
Daily traffic
16,500
2021 count
Owner
State
State Highway Agency

About this bridge

US421 over Fish Dam Creek is a concrete continuous culvert carrying US421 over Fish Dam Creek in Wilkes County, North Carolina. It was built in 1955 and reconstructed in 2004, so it is 70 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 16,500 vehicles a day, roughly 12% of them trucks, projected to reach 33,000 by 2040. The structure is 35 ft (10.6 m) long. If it were closed, the detour would be 3.7 mi (6 km).

CarriesUS421
CrossesFish Dam Creek
Location.5 MI.W.JCT.NC16
RouteU.S. Route 421
Coordinates36.14984, -81.24082
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: 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 rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length35 ft (10.6 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,500 (2021)
Projected traffic33,000 by 2040
Trucks12%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 over Fish Dam Creek built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2004.

What condition is US421 over Fish Dam 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 April 2023.

How much traffic does US421 over Fish Dam Creek carry?

About 16,500 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is US421 over Fish Dam Creek?

The structure is 35 ft (10.6 m) long with a longest span of 11 ft (3.3 m).

Who owns US421 over Fish Dam Creek?

It is owned by the State Highway Agency.