US Bridges

160th ST over Big Whiskey Slough

Good

Plymouth County, Iowa · 9243020110 · Structure no. 000000000273901

Built
2015
10 years old
Condition
Good
inspected April 2023
Type
Slab
Concrete Continuous
Length
93 ft
1 main span
Daily traffic
34
2022 count
Owner
County
County Highway Agency

About this bridge

160th ST over Big Whiskey Slough is a concrete continuous slab carrying 160th ST over Big Whiskey Slough in Plymouth 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 34 vehicles a day, projected to reach 34 by 2044. The structure is 93 ft (28.3 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries160th ST
CrossesBig Whiskey Slough
Location9243020110
RouteCounty Highway 0
StateIowa
Coordinates42.82265, -95.88715
Functional classRural Local

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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73.6 US tons
Inventory rating44.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadHS 20
Structure length93 ft (28.3 m)
Longest span36 ft (11 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (2022)
Projected traffic34 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 160th ST over Big Whiskey Slough built?

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

What condition is 160th ST over Big Whiskey Slough 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 April 2023.

How much traffic does 160th ST over Big Whiskey Slough carry?

About 34 vehicles per day (2022 count).

How long is 160th ST over Big Whiskey Slough?

The structure is 93 ft (28.3 m) long with a longest span of 36 ft (11 m) and a deck 33 ft wide.

Who owns 160th ST over Big Whiskey Slough?

It is owned by the County Highway Agency.