US Bridges

30 Ave over Small Natural Stream

Poor

Benton County, Iowa · 082091710 · Structure no. 000000000014560

Built
1958
67 years old
Condition
Poor
inspected April 2024
Type
Culvert
Concrete Continuous
Length
58 ft
3 main spans
Daily traffic
1,561
2022 count
Owner
County
County Highway Agency

About this bridge

30 Ave over Small Natural Stream is a concrete continuous culvert carrying 30 Ave over Small Natural Stream in Benton County, Iowa. It was built in 1958, so it is 67 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.

It carries about 1,561 vehicles a day, roughly 9% of them trucks, projected to reach 1,561 by 2044. The structure is 58 ft (17.7 m) long and 32 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
Carries30 Ave
CrossesSmall Natural Stream
Location082091710
RouteCounty Highway 0
CountyBenton County
StateIowa
Coordinates41.90541, -91.91108
Functional classRural Major Collector

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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating76.2 US tons
Inventory rating45.7 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 20
Structure length58 ft (17.7 m)
Longest span20 ft (6.1 m)
Deck width32 ft (9.8 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,561 (2022)
Projected traffic1,561 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 30 Ave over Small Natural Stream built?

It was built in 1958, making it 67 years old in 2025.

What condition is 30 Ave over Small Natural Stream 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 April 2024.

How much traffic does 30 Ave over Small Natural Stream carry?

About 1,561 vehicles per day (2022 count), of which roughly 9% are trucks.

How long is 30 Ave over Small Natural Stream?

The structure is 58 ft (17.7 m) long with a longest span of 20 ft (6.1 m) and a deck 32 ft wide.

Who owns 30 Ave over Small Natural Stream?

It is owned by the County Highway Agency.