US Bridges

172nd ST over Small Stream

Fair

Clayton County, Iowa · 094050700 · Structure no. 000000000120461

Built
2016
9 years old
Condition
Fair
inspected October 2024
Type
Culvert
Steel
Length
22 ft
2 main spans
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

172nd ST over Small Stream is a steel culvert carrying 172nd ST over Small Stream in Clayton County, Iowa. It was built in 2016, so it is 9 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 26 vehicles a day, roughly 27% of them trucks, projected to reach 26 by 2044. The structure is 22 ft (6.7 m) long and 30 ft wide.

Carries172nd ST
CrossesSmall Stream
Location094050700
RouteCounty Highway 0
StateIowa
Coordinates42.97514, -91.47725
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.6 US tons
Inventory rating24.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadOther
Structure length22 ft (6.7 m)
Longest span10 ft (3 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 by 2044
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 172nd ST over Small Stream built?

It was built in 2016, making it 9 years old in 2025.

What condition is 172nd ST over Small Stream in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does 172nd ST over Small Stream carry?

About 26 vehicles per day (2022 count), of which roughly 27% are trucks.

How long is 172nd ST over Small Stream?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m) and a deck 30 ft wide.

Who owns 172nd ST over Small Stream?

It is owned by the County Highway Agency.