US Bridges

550th Ave over Hamilton-Story 1 Open Dd

Good

Story County, Iowa · 1.5 Miles S of E18 · Structure no. 000000000316411

Built
2015
10 years old
Condition
Good
inspected November 2022
Type
Culvert
Concrete Continuous
Length
29 ft
2 main spans
Daily traffic
80
2022 count
Owner
County
County Highway Agency

About this bridge

550th Ave over Hamilton-Story 1 Open Dd is a concrete continuous culvert carrying 550th Ave over Hamilton-Story 1 Open Dd in Story County, Iowa. It was built in 2015, so it is 10 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 80 vehicles a day, projected to reach 80 by 2043. The structure is 29 ft (8.7 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
Carries550th Ave
CrossesHamilton-Story 1 Open Dd
Location1.5 Miles S of E18
RouteCounty Highway 0
CountyStory County
StateIowa
Coordinates42.14283, -93.60096
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.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2022
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 rating48.2 US tons
Inventory rating37.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHL 93
Structure length29 ft (8.7 m)
Longest span14 ft (4.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic80 (2022)
Projected traffic80 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 Hamilton-Story 1 Open Dd built?

It was built in 2015, making it 10 years old in 2025.

What condition is 550th Ave over Hamilton-Story 1 Open Dd 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 November 2022.

How much traffic does 550th Ave over Hamilton-Story 1 Open Dd carry?

About 80 vehicles per day (2022 count).

How long is 550th Ave over Hamilton-Story 1 Open Dd?

The structure is 29 ft (8.7 m) long with a longest span of 14 ft (4.2 m).

Who owns 550th Ave over Hamilton-Story 1 Open Dd?

It is owned by the County Highway Agency.