US Bridges

Walnut Ave over Small Stream

Fair

Mitchell County, Iowa · 099150202 · Structure no. 000000000036640

Built
1950
75 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
34 ft
1 main span
Daily traffic
462
2022 count
Owner
County
County Highway Agency

About this bridge

Walnut Ave over Small Stream is a steel stringer/multi-beam or girder carrying Walnut Ave over Small Stream in Mitchell County, Iowa. It was built in 1950, so it is 75 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 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 462 vehicles a day, projected to reach 462 by 2043. The structure is 34 ft (10.4 m) long and 35 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

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CarriesWalnut Ave
CrossesSmall Stream
Location099150202
RouteCounty Highway 0
CountyMitchell County
StateIowa
Coordinates43.42348, -92.59376
Functional classRural Major 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating27 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length34 ft (10.4 m)
Longest span32 ft (9.8 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic462 (2022)
Projected traffic462 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Walnut Ave over Small Stream built?

It was built in 1950, making it 75 years old in 2025.

What condition is Walnut Ave over Small 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 December 2023.

How much traffic does Walnut Ave over Small Stream carry?

About 462 vehicles per day (2022 count).

How long is Walnut Ave over Small Stream?

The structure is 34 ft (10.4 m) long with a longest span of 32 ft (9.8 m) and a deck 35 ft wide.

Who owns Walnut Ave over Small Stream?

It is owned by the County Highway Agency.