US Bridges

N Illinois Ave over Winnebago River

Fair

Cerro Gordo County, Iowa · 000000000 · Structure no. 000000000008155

Built
1970
55 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
218 ft
3 main spans
Daily traffic
3,886
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Illinois Ave over Winnebago River is a prestressed concrete continuous stringer/multi-beam or girder carrying N Illinois Ave over Winnebago River in Cerro Gordo County, Iowa. It was built in 1970, so it is 55 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 3,886 vehicles a day, projected to reach 3,886 by 2044. The structure is 218 ft (66.4 m) long and 52 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN Illinois Ave
CrossesWinnebago River
Location000000000
RouteCity Street 0
CountyCerro Gordo County
StateIowa
Coordinates43.15291, -93.1712
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating93.3 US tons
Inventory rating71.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length218 ft (66.4 m)
Longest span80 ft (24.4 m)
Deck width52 ft (15.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,886 (2022)
Projected traffic3,886 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 N Illinois Ave over Winnebago River built?

It was built in 1970, making it 55 years old in 2025.

What condition is N Illinois Ave 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 January 2024.

How much traffic does N Illinois Ave over Winnebago River carry?

About 3,886 vehicles per day (2022 count).

How long is N Illinois Ave over Winnebago River?

The structure is 218 ft (66.4 m) long with a longest span of 80 ft (24.4 m) and a deck 52 ft wide.

Who owns N Illinois Ave over Winnebago River?

It is owned by the City or Municipal Highway Agency.