US Bridges

I-35 & I-80 over N Walnut Creek

Fair

Polk County, Iowa · 1.1 Miles E of JCT Ia 141 · Structure no. 000000000041400

Built
1958
67 years old, rebuilt 2016
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
81,600
2023 count
Owner
State
State Highway Agency

About this bridge

I-35 & I-80 over N Walnut Creek is a concrete continuous culvert carrying I-35 & I-80 over N Walnut Creek in Polk County, Iowa. It was built in 1958 and reconstructed in 2016, so it is 67 years old, older than the Iowa average of 45.5 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 81,600 vehicles a day, roughly 22% of them trucks, projected to reach 81,600 by 2043. The structure is 27 ft (8.2 m) long.

CarriesI-35 & I-80
CrossesN Walnut Creek
Location1.1 Miles E of JCT Ia 141
RouteInterstate 80
StateIowa
Coordinates41.65159, -93.75389
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27 US tons
Inventory rating20 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81,600 (2023)
Projected traffic81,600 by 2043
Trucks22%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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-35 & I-80 over N Walnut Creek built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2016.

What condition is I-35 & I-80 over N 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 March 2023.

How much traffic does I-35 & I-80 over N Walnut Creek carry?

About 81,600 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is I-35 & I-80 over N Walnut Creek?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m).

Who owns I-35 & I-80 over N Walnut Creek?

It is owned by the State Highway Agency.