US Bridges

1350 170th ST over West Iowa River

Poor

Hancock County, Iowa · 095243101 · Structure no. 000000000173351

Built
1979
46 years old
Condition
Poor
inspected March 2024
Type
Slab
Concrete Continuous
Length
114 ft
3 main spans
Daily traffic
569
2022 count
Owner
County
County Highway Agency

About this bridge

1350 170th ST over West Iowa River is a concrete continuous slab carrying 1350 170th ST over West Iowa River in Hancock County, Iowa. It was built in 1979, so it is 46 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 569 vehicles a day, roughly 19% of them trucks, projected to reach 569 by 2044. The structure is 114 ft (34.7 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries1350 170th ST
CrossesWest Iowa River
Location095243101
RouteCounty Highway 0
CountyHancock County
StateIowa
Coordinates43.00982, -93.72481
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating54 US tons
Inventory rating31.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length114 ft (34.7 m)
Longest span44 ft (13.4 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic569 (2022)
Projected traffic569 by 2044
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$17,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 1350 170th ST over West Iowa River built?

It was built in 1979, making it 46 years old in 2025.

What condition is 1350 170th ST over West Iowa River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does 1350 170th ST over West Iowa River carry?

About 569 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is 1350 170th ST over West Iowa River?

The structure is 114 ft (34.7 m) long with a longest span of 44 ft (13.4 m) and a deck 32 ft wide.

Who owns 1350 170th ST over West Iowa River?

It is owned by the County Highway Agency.