170th ST over Two Mile Creek

Good

Union County, Iowa · 072291103 · Structure no. 000000000325612

Built: 2021; 4 years old
Condition: Good; inspected October 2023
Type: Slab; Concrete Continuous
Length: 91 ft; 3 main spans
Daily traffic: 46; 2022 count
Owner: County; County Highway Agency

About this bridge

170th ST over Two Mile Creek is a concrete continuous slab carrying 170th ST over Two Mile Creek in Union County, Iowa. It was built in 2021, so it is 4 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 46 vehicles a day, projected to reach 46 by 2043. The structure is 91 ft (27.7 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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Carries170th ST

CrossesTwo Mile Creek

Location072291103

RouteCounty Highway 0

CountyUnion County

StateIowa

Coordinates41.05626, -94.16186

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.

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 inspectionOctober 2023

Inspection intervalevery 24 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 alignment8: Equal to present desirable criteria

Operating rating46.4 US tons

Inventory rating35.7 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHL 93

Structure length91 ft (27.7 m)

Longest span35 ft (10.7 m)

Deck width33 ft (10.1 m)

Roadway width31 ft (9.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic46 (2022)

Projected traffic46 by 2043

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 proposedOther structural work, including hydraulic replacements

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was 170th ST over Two Mile Creek built?

It was built in 2021, making it 4 years old in 2025.

What condition is 170th ST over Two Mile Creek 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 October 2023.

How much traffic does 170th ST over Two Mile Creek carry?

About 46 vehicles per day (2022 count).

How long is 170th ST over Two Mile Creek?

The structure is 91 ft (27.7 m) long with a longest span of 35 ft (10.7 m) and a deck 33 ft wide.

Who owns 170th ST over Two Mile Creek?

It is owned by the County Highway Agency.