FM over Sixmile Creek

Fair

Sioux County, Iowa · 095460301 · Structure no. 000000000310421

Built: 1972; 53 years old
Condition: Fair; inspected February 2023
Type: Slab; Concrete Continuous
Length: 100 ft; 3 main spans
Daily traffic: 1,926; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Sixmile Creek is a concrete continuous slab carrying FM over Sixmile Creek in Sioux County, Iowa. It was built in 1972, so it is 53 years old, older 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 1,926 vehicles a day, roughly 19% of them trucks, projected to reach 1,926 by 2043. The structure is 100 ft (30.5 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps

CarriesFM

CrossesSixmile Creek

Location095460301

RouteCounty Highway 0

CountySioux County

StateIowa

Coordinates43.0841, -96.26495

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	7 Good	Some minor problems.
Channel and channel protection	8 Very Good	No problems noted.

Last inspectionFebruary 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

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 length100 ft (30.5 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 traffic1,926 (2022)

Projected traffic1,926 by 2043

Trucks19%

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 Sixmile Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is FM over Sixmile Creek 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 February 2023.

How much traffic does FM over Sixmile Creek carry?

About 1,926 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is FM over Sixmile Creek?

The structure is 100 ft (30.5 m) long with a longest span of 39 ft (11.9 m) and a deck 32 ft wide.

Who owns FM over Sixmile Creek?

It is owned by the County Highway Agency.