US Bridges

US221 421 over Gap Creek

Fair

Watauga County, North Carolina · 150FT.N.JCT.US221 421 · Structure no. 000000001890072

Built
2004
21 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete Continuous
Length
27 ft
3 main spans
Daily traffic
11,000
2021 count
Owner
State
State Highway Agency

About this bridge

US221 421 over Gap Creek is a concrete continuous culvert carrying US221 421 over Gap Creek in Watauga County, North Carolina. It was built in 2004, so it is 21 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 11,000 vehicles a day, roughly 14% of them trucks, projected to reach 22,000 by 2040. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 10.6 mi (17 km).

CarriesUS221 421
CrossesGap Creek
Location150FT.N.JCT.US221 421
RouteU.S. Route 221
Coordinates36.23653, -81.50968
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 rating63.9 US tons
Inventory rating48.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHL 93
Structure length27 ft (8.2 m)
Longest span8 ft (2.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2021)
Projected traffic22,000 by 2040
Trucks14%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed10.6 mi (17 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 US221 421 over Gap Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is US221 421 over Gap 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 October 2023.

How much traffic does US221 421 over Gap Creek carry?

About 11,000 vehicles per day (2021 count), of which roughly 14% are trucks.

How long is US221 421 over Gap Creek?

The structure is 27 ft (8.2 m) long with a longest span of 8 ft (2.4 m).

Who owns US221 421 over Gap Creek?

It is owned by the State Highway Agency.