US Bridges

550th Ave over Small Stream

Good

Story County, Iowa · 550th Ov Small Stream · Structure no. 000000000314931

Built
2022
3 years old
Condition
Good
inspected December 2022
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
40
2022 count
Owner
County
County Highway Agency

About this bridge

550th Ave over Small Stream is a concrete culvert carrying 550th Ave over Small Stream in Story County, Iowa. It was built in 2022, so it is 3 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 40 vehicles a day, projected to reach 40 by 2043. The structure is 26 ft (8 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries550th Ave
CrossesSmall Stream
Location550th Ov Small Stream
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates41.98379, -93.60044
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 protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.2 US tons
Inventory rating36.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length26 ft (8 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 traffic40 (2022)
Projected traffic40 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 550th Ave over Small Stream built?

It was built in 2022, making it 3 years old in 2025.

What condition is 550th 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 December 2022.

How much traffic does 550th Ave over Small Stream carry?

About 40 vehicles per day (2022 count).

How long is 550th Ave over Small Stream?

The structure is 26 ft (8 m) long with a longest span of 12 ft (3.7 m).

Who owns 550th Ave over Small Stream?

It is owned by the County Highway Agency.