US Bridges

156th ST NB over Walnut Creek

Good

Dallas County, Iowa · 200 Ft North of Brookview · Structure no. 000000000505340

Built
2015
10 years old
Condition
Good
inspected June 2024
Type
Slab
Concrete Continuous
Length
171 ft
3 main spans
Daily traffic
222
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

156th ST NB over Walnut Creek is a concrete continuous slab carrying 156th ST NB over Walnut Creek in Dallas County, Iowa. It was built in 2015, so it is 10 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 222 vehicles a day, projected to reach 222 by 2044. The structure is 171 ft (52.1 m) long and 39 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries156th ST NB
CrossesWalnut Creek
Location200 Ft North of Brookview
RouteCity Street 0
CountyDallas County
StateIowa
Coordinates41.65158, -93.83353
Functional classUrban Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
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 evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length171 ft (52.1 m)
Longest span68 ft (20.7 m)
Deck width39 ft (11.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic222 (2022)
Projected traffic222 by 2044
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 156th ST NB over Walnut Creek built?

It was built in 2015, making it 10 years old in 2025.

What condition is 156th ST NB 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 June 2024.

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

About 222 vehicles per day (2022 count).

How long is 156th ST NB over Walnut Creek?

The structure is 171 ft (52.1 m) long with a longest span of 68 ft (20.7 m) and a deck 39 ft wide.

Who owns 156th ST NB over Walnut Creek?

It is owned by the City or Municipal Highway Agency.