US Bridges

FM over Little Sioux River

Good

Woodbury County, Iowa · 089423404 · Structure no. 000000000354701

Built
2006
19 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
409 ft
3 main spans
Daily traffic
797
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Little Sioux River is a prestressed concrete stringer/multi-beam or girder carrying FM over Little Sioux River in Woodbury County, Iowa. It was built in 2006, so it is 19 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 797 vehicles a day, roughly 35% of them trucks, projected to reach 797 by 2043. The structure is 409 ft (124.7 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesFM
CrossesLittle Sioux River
Location089423404
RouteCounty Highway 0
StateIowa
Coordinates42.48541, -95.79029
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.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 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 geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.3 US tons
Inventory rating41.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length409 ft (124.7 m)
Longest span135 ft (41.1 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic797 (2022)
Projected traffic797 by 2043
Trucks35%
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 FM over Little Sioux River built?

It was built in 2006, making it 19 years old in 2025.

What condition is FM over Little Sioux River 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 June 2023.

How much traffic does FM over Little Sioux River carry?

About 797 vehicles per day (2022 count), of which roughly 35% are trucks.

How long is FM over Little Sioux River?

The structure is 409 ft (124.7 m) long with a longest span of 135 ft (41.1 m) and a deck 33 ft wide.

Who owns FM over Little Sioux River?

It is owned by the County Highway Agency.