US Bridges

Douglas Ave over N Walnut Creek

Fair

Polk County, Iowa · O37600434 · Structure no. 000000000011430

Built
1960
65 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete Continuous
Length
51 ft
3 main spans
Daily traffic
10,078
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Douglas Ave over N Walnut Creek is a concrete continuous culvert carrying Douglas Ave over N Walnut Creek in Polk County, Iowa. It was built in 1960, so it is 65 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 5 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 10,078 vehicles a day, projected to reach 10,078 by 2044. The structure is 51 ft (15.5 m) long.

CarriesDouglas Ave
CrossesN Walnut Creek
LocationO37600434
RouteCity Street 0
StateIowa
Coordinates41.62918, -93.74155
Functional classUrban Other Principal Arterial

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.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating33.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span18 ft (5.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,078 (2022)
Projected traffic10,078 by 2044
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Douglas Ave over N Walnut Creek built?

It was built in 1960, making it 65 years old in 2025.

What condition is Douglas Ave 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 June 2024.

How much traffic does Douglas Ave over N Walnut Creek carry?

About 10,078 vehicles per day (2022 count).

How long is Douglas Ave over N Walnut Creek?

The structure is 51 ft (15.5 m) long with a longest span of 18 ft (5.5 m).

Who owns Douglas Ave over N Walnut Creek?

It is owned by the City or Municipal Highway Agency.