US Bridges

350th Ave over Stream

FairPosted for load

Poweshiek County, Iowa · 081143601 · Structure no. 000000000294480

Built
1953
72 years old, rebuilt 2007
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
23 ft
1 main span
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

350th Ave over Stream is a wood or timber stringer/multi-beam or girder carrying 350th Ave over Stream in Poweshiek County, Iowa. It was built in 1953 and reconstructed in 2007, so it is 72 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. Its operating status is: posted for other load-capacity restriction.

It carries about 50 vehicles a day, projected to reach 50 by 2043. The structure is 23 ft (7 m) long and 25 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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Carries350th Ave
CrossesStream
Location081143601
RouteCounty Highway 0
CountyPoweshiek County
StateIowa
Coordinates41.78971, -92.41785
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 protection7 GoodSome minor problems.
Last inspectionDecember 2023
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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38.7 US tons
Inventory rating31.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length23 ft (7 m)
Longest span22 ft (6.7 m)
Deck width25 ft (7.6 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic50 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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$323,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 350th Ave over Stream built?

It was built in 1953, making it 72 years old in 2025. It was reconstructed in 2007.

What condition is 350th 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 December 2023.

How much traffic does 350th Ave over Stream carry?

About 50 vehicles per day (2022 count).

How long is 350th Ave over Stream?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.7 m) and a deck 25 ft wide.

Who owns 350th Ave over Stream?

It is owned by the County Highway Agency.