US Bridges

185th ST over Drainage Ditch

Fair

Howard County, Iowa · 097130205 · Structure no. 000000000028831

Built
1992
33 years old
Condition
Fair
inspected April 2021
Type
Culvert
Concrete Continuous
Length
45 ft
3 main spans
Daily traffic
412
2022 count
Owner
County
County Highway Agency

About this bridge

185th ST over Drainage Ditch is a concrete continuous culvert carrying 185th ST over Drainage Ditch in Howard County, Iowa. It was built in 1992, so it is 33 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 412 vehicles a day, roughly 13% of them trucks, projected to reach 412 by 2043. The structure is 45 ft (13.7 m) long. If it were closed, the detour would be 21.1 mi (34 km).

Location

Open in Google Maps
Carries185th ST
CrossesDrainage Ditch
Location097130205
RouteCounty Highway 0
CountyHoward County
StateIowa
Coordinates43.24941, -92.3376
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic412 (2022)
Projected traffic412 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.1 mi (34 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 185th ST over Drainage Ditch built?

It was built in 1992, making it 33 years old in 2025.

What condition is 185th ST over Drainage Ditch in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in April 2021.

How much traffic does 185th ST over Drainage Ditch carry?

About 412 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is 185th ST over Drainage Ditch?

The structure is 45 ft (13.7 m) long with a longest span of 14 ft (4.3 m).

Who owns 185th ST over Drainage Ditch?

It is owned by the County Highway Agency.