US Bridges

Iowa Ave over Stream

FairPosted for load

Clayton County, Iowa · 091042604 · Structure no. 000000000118420

Built
1940
85 years old
Condition
Fair
inspected November 2024
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
79
2022 count
Owner
County
County Highway Agency

About this bridge

Iowa Ave over Stream is a concrete culvert carrying Iowa Ave over Stream in Clayton County, Iowa. It was built in 1940, so it is 85 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. Its operating status is: posted for other load-capacity restriction.

It carries about 79 vehicles a day, projected to reach 79 by 2044. The structure is 27 ft (8.2 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesIowa Ave
CrossesStream
Location091042604
RouteCounty Highway 0
CountyClayton County
StateIowa
Coordinates42.66946, -91.28879
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating25.6 US tons
Inventory rating18.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width24 ft (7.3 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic79 (2022)
Projected traffic79 by 2044
Trucks0%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Iowa Ave over Stream built?

It was built in 1940, making it 85 years old in 2025.

What condition is Iowa Ave over Stream 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 November 2024.

How much traffic does Iowa Ave over Stream carry?

About 79 vehicles per day (2022 count).

How long is Iowa Ave over Stream?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m) and a deck 24 ft wide.

Who owns Iowa Ave over Stream?

It is owned by the County Highway Agency.