US Bridges

I40 over Walnut Creek

Fair

Wake County, North Carolina · 0.5 Mi. W. Jct. US1 · Structure no. 000000001830587

Built
1982
43 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
100,000
2020 count
Owner
State
State Highway Agency

About this bridge

I40 over Walnut Creek is a concrete continuous culvert carrying I40 over Walnut Creek in Wake County, North Carolina. It was built in 1982, so it is 43 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 100,000 vehicles a day, roughly 16% of them trucks, projected to reach 200,000 by 2040. The structure is 32 ft (9.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesI40
CrossesWalnut Creek
Location0.5 Mi. W. Jct. US1
RouteInterstate 40
Coordinates35.77188, -78.74107
Functional classUrban Principal Arterial - Interstate

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 rating46 US tons
Inventory rating35.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length32 ft (9.7 m)
Longest span9 ft (2.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100,000 (2020)
Projected traffic200,000 by 2040
Trucks16%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 I40 over Walnut Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is I40 over Walnut 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 I40 over Walnut Creek carry?

About 100,000 vehicles per day (2020 count), of which roughly 16% are trucks.

How long is I40 over Walnut Creek?

The structure is 32 ft (9.7 m) long with a longest span of 9 ft (2.7 m).

Who owns I40 over Walnut Creek?

It is owned by the State Highway Agency.