302nd Avenue over Small Stream

Good

Clinton County, Iowa · 082E40403 · Structure no. 000000000123721

Built: 2005; 20 years old
Condition: Good; inspected February 2021
Type: Slab; Concrete Continuous
Length: 92 ft; 3 main spans
Daily traffic: 660; 2022 count
Owner: County; County Highway Agency

About this bridge

302nd Avenue over Small Stream is a concrete continuous slab carrying 302nd Avenue over Small Stream in Clinton County, Iowa. It was built in 2005, so it is 20 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 660 vehicles a day, roughly 13% of them trucks, projected to reach 660 by 2043. The structure is 92 ft (28 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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Carries302nd Avenue

CrossesSmall Stream

Location082E40403

RouteCounty Highway 0

CountyClinton County

StateIowa

Coordinates41.9449, -90.5035

Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

Component	Rating	Meaning
Deck	8 Very Good	No problems noted.
Superstructure	8 Very Good	No problems noted.
Substructure	8 Very Good	No problems noted.
Channel and channel protection	8 Very Good	No problems noted.

Last inspectionFebruary 2021

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation8: Equal to present desirable criteria

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating75.8 US tons

Inventory rating43.7 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length92 ft (28 m)

Longest span34 ft (10.4 m)

Deck width33 ft (10.1 m)

Roadway width31 ft (9.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic660 (2022)

Projected traffic660 by 2043

Trucks13%

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 proposedNone recorded

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was 302nd Avenue over Small Stream built?

It was built in 2005, making it 20 years old in 2025.

What condition is 302nd Avenue over Small Stream in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in February 2021.

How much traffic does 302nd Avenue over Small Stream carry?

About 660 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is 302nd Avenue over Small Stream?

The structure is 92 ft (28 m) long with a longest span of 34 ft (10.4 m) and a deck 33 ft wide.

Who owns 302nd Avenue over Small Stream?

It is owned by the County Highway Agency.