D55 290th ST over Drainage

Good

Hardin County, Iowa · 086191101 · Structure no. 000000000174542

Built: 2016; 9 years old
Condition: Good; inspected February 2023
Type: Slab; Concrete Continuous
Length: 101 ft; 3 main spans
Daily traffic: 69; 2022 count
Owner: County; County Highway Agency

About this bridge

D55 290th ST over Drainage is a concrete continuous slab carrying D55 290th ST over Drainage in Hardin County, Iowa. It was built in 2016, so it is 9 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 69 vehicles a day, projected to reach 69 by 2043. The structure is 101 ft (30.8 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesD55 290th ST

CrossesDrainage

Location086191101

RouteCounty Highway 0

CountyHardin County

StateIowa

Coordinates42.28147, -93.03979

Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

Component	Rating	Meaning
Deck	8 Very Good	No problems noted.
Superstructure	8 Very Good	No problems noted.
Substructure	8 Very Good	No problems noted.
Channel and channel protection	8 Very Good	No problems noted.

Last inspectionFebruary 2023

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour within limits of footing or piles

Structural evaluation8: Equal to present desirable criteria

Deck geometry7: Better than present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating57.5 US tons

Inventory rating44.3 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckNot applicable

Main spans3

Design loadHL 93

Structure length101 ft (30.8 m)

Longest span39 ft (11.9 m)

Deck width33 ft (10.1 m)

Roadway width31 ft (9.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic69 (2022)

Projected traffic69 by 2043

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed1.9 mi (3 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 D55 290th ST over Drainage built?

It was built in 2016, making it 9 years old in 2025.

What condition is D55 290th ST over Drainage 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 2023.

How much traffic does D55 290th ST over Drainage carry?

About 69 vehicles per day (2022 count).

How long is D55 290th ST over Drainage?

The structure is 101 ft (30.8 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns D55 290th ST over Drainage?

It is owned by the County Highway Agency.