US Bridges

FM over Winnebago River

Fair

Winnebago County, Iowa · 100232103 · Structure no. 000000000345481

Built
2002
23 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
113 ft
3 main spans
Daily traffic
270
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Winnebago River is a concrete continuous slab carrying FM over Winnebago River in Winnebago County, Iowa. It was built in 2002, so it is 23 years old, younger 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 5 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 270 vehicles a day, roughly 10% of them trucks, projected to reach 270 by 2043. The structure is 113 ft (34.4 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesFM
CrossesWinnebago River
Location100232103
RouteCounty Highway 0
CountyWinnebago County
StateIowa
Coordinates43.46796, -93.57573
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating91.9 US tons
Inventory rating55.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length113 ft (34.4 m)
Longest span44 ft (13.4 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic270 (2022)
Projected traffic270 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.4 million (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Winnebago River built?

It was built in 2002, making it 23 years old in 2025.

What condition is FM over Winnebago River 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 March 2023.

How much traffic does FM over Winnebago River carry?

About 270 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is FM over Winnebago River?

The structure is 113 ft (34.4 m) long with a longest span of 44 ft (13.4 m) and a deck 33 ft wide.

Who owns FM over Winnebago River?

It is owned by the County Highway Agency.