FM over Willow CR

Good

Sioux County, Iowa · 094431702 · Structure no. 000000000308180

Built: 1973; 52 years old
Condition: Good; inspected April 2023
Type: Slab; Concrete Continuous
Length: 103 ft; 3 main spans
Daily traffic: 722; 2021 count
Owner: County; County Highway Agency

About this bridge

FM over Willow CR is a concrete continuous slab carrying FM over Willow CR in Sioux County, Iowa. It was built in 1973, so it is 52 years old, older 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 722 vehicles a day, roughly 18% of them trucks, projected to reach 722 by 2043. The structure is 103 ft (31.4 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesFM

CrossesWillow CR

Location094431702

RouteCounty Highway 0

CountySioux County

StateIowa

Coordinates42.96324, -95.95813

Functional classRural Major 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	7 Good	Some minor problems.
Superstructure	7 Good	Some minor problems.
Substructure	7 Good	Some minor problems.
Channel and channel protection	8 Very Good	No problems noted.

Last inspectionApril 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating54.9 US tons

Inventory rating33.1 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length103 ft (31.4 m)

Longest span39 ft (11.9 m)

Deck width32 ft (9.8 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic722 (2021)

Projected traffic722 by 2043

Trucks18%

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 proposedNone recorded

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Willow CR built?

It was built in 1973, making it 52 years old in 2025.

What condition is FM over Willow CR 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 April 2023.

How much traffic does FM over Willow CR carry?

About 722 vehicles per day (2021 count), of which roughly 18% are trucks.

How long is FM over Willow CR?

The structure is 103 ft (31.4 m) long with a longest span of 39 ft (11.9 m) and a deck 32 ft wide.

Who owns FM over Willow CR?

It is owned by the County Highway Agency.