US Bridges

330th Ave over Stream

Fair

Dickinson County, Iowa · 098353602 · Structure no. 000000000365885

Built
1974
51 years old
Condition
Fair
inspected April 2023
Type
Culvert
Steel
Length
39 ft
4 main spans
Daily traffic
20
2021 count
Owner
County
County Highway Agency

About this bridge

330th Ave over Stream is a steel culvert carrying 330th Ave over Stream in Dickinson County, Iowa. It was built in 1974, so it is 51 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 20 vehicles a day, projected to reach 20 by 2043. The structure is 39 ft (11.9 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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Carries330th Ave
CrossesStream
Location098353602
RouteCounty Highway 0
CountyDickinson County
StateIowa
Coordinates43.25919, -94.93364
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans4
Design loadHS 20
Structure length39 ft (11.9 m)
Longest span7 ft (2.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2021)
Projected traffic20 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 330th Ave over Stream built?

It was built in 1974, making it 51 years old in 2025.

What condition is 330th 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 April 2023.

How much traffic does 330th Ave over Stream carry?

About 20 vehicles per day (2021 count).

How long is 330th Ave over Stream?

The structure is 39 ft (11.9 m) long with a longest span of 7 ft (2.1 m).

Who owns 330th Ave over Stream?

It is owned by the County Highway Agency.