US Bridges

185th ST over Small Stream

Good

Buchanan County, Iowa · 089091703 · Structure no. 000000000082901

Built
2018
7 years old
Condition
Good
inspected February 2024
Type
Culvert
Steel
Length
30 ft
1 main span
Daily traffic
62
2022 count
Owner
County
County Highway Agency

About this bridge

185th ST over Small Stream is a steel culvert carrying 185th ST over Small Stream in Buchanan County, Iowa. It was built in 2018, so it is 7 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 62 vehicles a day, projected to reach 62 by 2044. The structure is 30 ft (9.1 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries185th ST
CrossesSmall Stream
Location089091703
RouteCounty Highway 0
CountyBuchanan County
StateIowa
Coordinates42.51911, -91.92896
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.
Culvert8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51.8 US tons
Inventory rating44.6 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHL 93
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width26 ft (7.9 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62 (2022)
Projected traffic62 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 185th ST over Small Stream built?

It was built in 2018, making it 7 years old in 2025.

What condition is 185th ST 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 February 2024.

How much traffic does 185th ST over Small Stream carry?

About 62 vehicles per day (2022 count).

How long is 185th ST over Small Stream?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 26 ft wide.

Who owns 185th ST over Small Stream?

It is owned by the County Highway Agency.