US Bridges

Kahle Ave over Carlan CR

PoorPosted for load

Clayton County, Iowa · 091030304 · Structure no. 000000000118210

Built
1900
125 years old, rebuilt 2003
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
21
2022 count
Owner
County
County Highway Agency

About this bridge

Kahle Ave over Carlan CR is a steel stringer/multi-beam or girder carrying Kahle Ave over Carlan CR in Clayton County, Iowa. It was built in 1900 and reconstructed in 2003, so it is 125 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for other load-capacity restriction.

It carries about 21 vehicles a day, projected to reach 21 by 2044. The structure is 40 ft (12.3 m) long and 23 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

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CarriesKahle Ave
CrossesCarlan CR
Location091030304
RouteCounty Highway 0
CountyClayton County
StateIowa
Coordinates42.71888, -91.17856
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38.3 US tons
Inventory rating29.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length40 ft (12.3 m)
Longest span38 ft (11.6 m)
Deck width23 ft (6.9 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21 (2022)
Projected traffic21 by 2044
Trucks0%
Lanes on structure2
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Kahle Ave over Carlan CR built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 2003.

What condition is Kahle Ave over Carlan CR in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does Kahle Ave over Carlan CR carry?

About 21 vehicles per day (2022 count).

How long is Kahle Ave over Carlan CR?

The structure is 40 ft (12.3 m) long with a longest span of 38 ft (11.6 m) and a deck 23 ft wide.

Who owns Kahle Ave over Carlan CR?

It is owned by the County Highway Agency.