US Bridges

US321 Nbl over Henry Fork River

Fair

Catawba County, North Carolina · 0.6 Mi. N. Jct. NC10 · Structure no. 000000000350325

Built
1997
28 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
536 ft
4 main spans
Daily traffic
17,000
2021 count
Owner
State
State Highway Agency

About this bridge

US321 Nbl over Henry Fork River is a steel continuous stringer/multi-beam or girder carrying US321 Nbl over Henry Fork River in Catawba County, North Carolina. It was built in 1997, so it is 28 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 17,000 vehicles a day, roughly 12% of them trucks, projected to reach 34,000 by 2040. The structure is 536 ft (163.3 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesUS321 Nbl
CrossesHenry Fork River
Location0.6 Mi. N. Jct. NC10
RouteU.S. Route 321
Coordinates35.64342, -81.30352
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.9 US tons
Inventory rating46 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length536 ft (163.3 m)
Longest span160 ft (48.7 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,000 (2021)
Projected traffic34,000 by 2040
Trucks12%
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 US321 Nbl over Henry Fork River built?

It was built in 1997, making it 28 years old in 2025.

What condition is US321 Nbl over Henry Fork River 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 January 2025.

How much traffic does US321 Nbl over Henry Fork River carry?

About 17,000 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is US321 Nbl over Henry Fork River?

The structure is 536 ft (163.3 m) long with a longest span of 160 ft (48.7 m) and a deck 41 ft wide.

Who owns US321 Nbl over Henry Fork River?

It is owned by the State Highway Agency.