US Bridges

170th ST over Small Stream

Good

Chickasaw County, Iowa · 096132801 · Structure no. 000000000112662

Built
2021
4 years old
Condition
Good
inspected March 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
88
2022 count
Owner
County
County Highway Agency

About this bridge

170th ST over Small Stream is a concrete continuous culvert carrying 170th ST over Small Stream in Chickasaw County, Iowa. It was built in 2021, so it is 4 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 88 vehicles a day, projected to reach 88 by 2044. The structure is 25 ft (7.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries170th ST
CrossesSmall Stream
Location096132801
RouteCounty Highway 0
CountyChickasaw County
StateIowa
Coordinates43.1124, -92.38151
Functional classRural Minor Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
Structure length25 ft (7.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic88 (2022)
Projected traffic88 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 170th ST over Small Stream built?

It was built in 2021, making it 4 years old in 2025.

What condition is 170th ST over Small Stream 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 March 2024.

How much traffic does 170th ST over Small Stream carry?

About 88 vehicles per day (2022 count).

How long is 170th ST over Small Stream?

The structure is 25 ft (7.5 m) long with a longest span of 12 ft (3.7 m).

Who owns 170th ST over Small Stream?

It is owned by the County Highway Agency.