US Bridges

231st Ave over Small Stream

Good

Delaware County, Iowa · 087 04 19 09 · Structure no. 000000000139611

Built
2013
12 years old
Condition
Good
inspected November 2024
Type
Other
Steel
Length
68 ft
1 main span
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

231st Ave over Small Stream is a steel other carrying 231st Ave over Small Stream in Delaware County, Iowa. It was built in 2013, so it is 12 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 11 vehicles a day, projected to reach 11 by 2044. The structure is 68 ft (20.7 m) long and 17 ft wide.

Location

Open in Google Maps
Carries231st Ave
CrossesSmall Stream
Location087 04 19 09
RouteCounty Highway 0
CountyDelaware County
StateIowa
Coordinates42.33641, -91.34491
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating34.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeOther
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length68 ft (20.7 m)
Longest span66 ft (20.1 m)
Deck width17 ft (5.3 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 by 2044
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-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 231st Ave over Small Stream built?

It was built in 2013, making it 12 years old in 2025.

What condition is 231st 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 November 2024.

How much traffic does 231st Ave over Small Stream carry?

About 11 vehicles per day (2022 count).

How long is 231st Ave over Small Stream?

The structure is 68 ft (20.7 m) long with a longest span of 66 ft (20.1 m) and a deck 17 ft wide.

Who owns 231st Ave over Small Stream?

It is owned by the County Highway Agency.