US Bridges

NC105 over Boone Creek

Good

Watauga County, North Carolina · 100 FT.S.JCT.US221 US321 · Structure no. 000000001890026

Built
1964
61 years old
Condition
Good
inspected September 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
30,000
2022 count
Owner
State
State Highway Agency

About this bridge

NC105 over Boone Creek is a concrete continuous culvert carrying NC105 over Boone Creek in Watauga County, North Carolina. It was built in 1964, so it is 61 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 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 30,000 vehicles a day, roughly 12% of them trucks, projected to reach 60,000 by 2040. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 5 mi (8 km).

CarriesNC105
CrossesBoone Creek
Location100 FT.S.JCT.US221 US321
RouteState Highway 105
Coordinates36.20529, -81.66986
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating48.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,000 (2022)
Projected traffic60,000 by 2040
Trucks12%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 NC105 over Boone Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is NC105 over Boone Creek 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 September 2023.

How much traffic does NC105 over Boone Creek carry?

About 30,000 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is NC105 over Boone Creek?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns NC105 over Boone Creek?

It is owned by the State Highway Agency.