US Bridges

580th Ave over Small Stream

Good

Story County, Iowa · 083233302 · Structure no. 000000000362925

Built
1987
38 years old
Condition
Good
inspected January 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
820
2023 count
Owner
County
County Highway Agency

About this bridge

580th Ave over Small Stream is a concrete continuous culvert carrying 580th Ave over Small Stream in Story County, Iowa. It was built in 1987, so it is 38 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 820 vehicles a day, projected to reach 820 by 2043. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
Carries580th Ave
CrossesSmall Stream
Location083233302
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.95763, -93.54106
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 protection6 SatisfactoryStructural elements show some minor deterioration.
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.7 US tons
Inventory rating45.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 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 traffic820 (2023)
Projected traffic820 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 580th Ave over Small Stream built?

It was built in 1987, making it 38 years old in 2025.

What condition is 580th 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 580th Ave over Small Stream carry?

About 820 vehicles per day (2023 count).

How long is 580th Ave over Small Stream?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns 580th Ave over Small Stream?

It is owned by the County Highway Agency.