US Bridges

560th Ave over Small Stream

Good

Story County, Iowa · 082231804 · Structure no. 000000000363745

Built
1994
31 years old
Condition
Good
inspected January 2023
Type
Culvert
Concrete Continuous
Length
23 ft
2 main spans
Daily traffic
259
2022 count
Owner
County
County Highway Agency

About this bridge

560th Ave over Small Stream is a concrete continuous culvert carrying 560th Ave over Small Stream in Story County, Iowa. It was built in 1994, so it is 31 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 259 vehicles a day, projected to reach 259 by 2043. The structure is 23 ft (7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries560th Ave
CrossesSmall Stream
Location082231804
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.90939, -93.57456
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating92 US tons
Inventory rating55.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length23 ft (7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic259 (2022)
Projected traffic259 by 2043
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 560th Ave over Small Stream built?

It was built in 1994, making it 31 years old in 2025.

What condition is 560th Ave 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 January 2023.

How much traffic does 560th Ave over Small Stream carry?

About 259 vehicles per day (2022 count).

How long is 560th Ave over Small Stream?

The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m).

Who owns 560th Ave over Small Stream?

It is owned by the County Highway Agency.