US Bridges

I-40 over Swannanoa River

Good

Buncombe County, North Carolina · .35 MI.E.JCT.SR2500 · Structure no. 000000000210490

Built
1973
52 years old
Condition
Good
inspected November 2021
Type
Culvert
Concrete Continuous
Length
87 ft
5 main spans
Daily traffic
42,000
2019 count
Owner
State
State Highway Agency

About this bridge

I-40 over Swannanoa River is a concrete continuous culvert carrying I-40 over Swannanoa River in Buncombe County, North Carolina. It was built in 1973, so it is 52 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 42,000 vehicles a day, roughly 16% of them trucks, projected to reach 84,000 by 2040. The structure is 87 ft (26.5 m) long. If it were closed, the detour would be 0.6 mi (1 km).

CarriesI-40
CrossesSwannanoa River
Location.35 MI.E.JCT.SR2500
RouteInterstate 40
Coordinates35.60707, -82.33439
Functional classUrban Principal Arterial - Interstate

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 inspectionNovember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.9 US tons
Inventory rating39.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans5
Design loadHS 20 + Mod
Structure length87 ft (26.5 m)
Longest span16 ft (4.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic42,000 (2019)
Projected traffic84,000 by 2040
Trucks16%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-40 over Swannanoa River built?

It was built in 1973, making it 52 years old in 2025.

What condition is I-40 over Swannanoa River 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 November 2021.

How much traffic does I-40 over Swannanoa River carry?

About 42,000 vehicles per day (2019 count), of which roughly 16% are trucks.

How long is I-40 over Swannanoa River?

The structure is 87 ft (26.5 m) long with a longest span of 16 ft (4.8 m).

Who owns I-40 over Swannanoa River?

It is owned by the State Highway Agency.