US Bridges

156th ST over Little Walnut Creek

Good

Dallas County, Iowa · P55000600 · Structure no. 000000000504930

Built
2007
18 years old
Condition
Good
inspected June 2024
Type
Slab
Concrete Continuous
Length
123 ft
3 main spans
Daily traffic
1,257
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

156th ST over Little Walnut Creek is a concrete continuous slab carrying 156th ST over Little Walnut Creek in Dallas County, Iowa. It was built in 2007, so it is 18 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 1,257 vehicles a day, projected to reach 1,257 by 2044. The structure is 123 ft (37.5 m) long and 41 ft wide.

Carries156th ST
CrossesLittle Walnut Creek
LocationP55000600
RouteCity Street 0
StateIowa
Coordinates41.63305, -93.83344
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating90.6 US tons
Inventory rating54.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length123 ft (37.5 m)
Longest span47 ft (14.3 m)
Deck width41 ft (12.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,257 (2022)
Projected traffic1,257 by 2044
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 156th ST over Little Walnut Creek built?

It was built in 2007, making it 18 years old in 2025.

What condition is 156th ST over Little 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 June 2024.

How much traffic does 156th ST over Little Walnut Creek carry?

About 1,257 vehicles per day (2022 count).

How long is 156th ST over Little Walnut Creek?

The structure is 123 ft (37.5 m) long with a longest span of 47 ft (14.3 m) and a deck 41 ft wide.

Who owns 156th ST over Little Walnut Creek?

It is owned by the City or Municipal Highway Agency.