US Bridges

Grand Ave over Walnut Creek

Good

Polk County, Iowa · Grand Avenue · Structure no. 000000000003732

Built
2013
12 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete Continuous
Length
168 ft
3 main spans
Daily traffic
14,881
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Grand Ave over Walnut Creek is a concrete continuous slab carrying Grand Ave over Walnut Creek in Polk County, Iowa. It was built in 2013, so it is 12 years old, younger than the Iowa average of 45.5 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 14,881 vehicles a day, roughly 1% of them trucks, projected to reach 14,881 by 2043. The structure is 168 ft (51.2 m) long and 86 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesGrand Ave
CrossesWalnut Creek
LocationGrand Avenue
RouteCity Street 0
StateIowa
Coordinates41.5827, -93.70322
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length168 ft (51.2 m)
Longest span65 ft (19.8 m)
Deck width86 ft (26.2 m)
Roadway width69 ft (21 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,881 (2022)
Projected traffic14,881 by 2043
Trucks1%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Grand Ave over Walnut Creek built?

It was built in 2013, making it 12 years old in 2025.

What condition is Grand Ave over Walnut 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 July 2023.

How much traffic does Grand Ave over Walnut Creek carry?

About 14,881 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Grand Ave over Walnut Creek?

The structure is 168 ft (51.2 m) long with a longest span of 65 ft (19.8 m) and a deck 86 ft wide.

Who owns Grand Ave over Walnut Creek?

It is owned by the City or Municipal Highway Agency.