410th Ave. over Harts Mill Creek

Good

Clinton County, Iowa · 082E62902 · Structure no. 000000000124381

Built: 1995; 30 years old
Condition: Good; inspected May 2024
Type: Tee Beam; Prestressed Concrete
Length: 30 ft; 1 main span
Daily traffic: 21; 2022 count
Owner: County; County Highway Agency

About this bridge

410th Ave. over Harts Mill Creek is a prestressed concrete tee beam carrying 410th Ave. over Harts Mill Creek in Clinton County, Iowa. It was built in 1995, so it is 30 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 21 vehicles a day, projected to reach 21 by 2044. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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Carries410th Ave.

CrossesHarts Mill Creek

Location082E62902

RouteCounty Highway 0

CountyClinton County

StateIowa

Coordinates41.87552, -90.29623

Functional classRural Local

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	7 Good	Some minor problems.
Channel and channel protection	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionMay 2024

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating65 US tons

Inventory rating38.9 US tons

Structure

Structure typeTee Beam

MaterialPrestressed Concrete

DeckConcrete, precast panels

Main spans1

Design loadHS 20

Structure length30 ft (9.1 m)

Longest span29 ft (8.8 m)

Deck width24 ft (7.3 m)

Roadway width24 ft (7.2 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21 (2022)

Projected traffic21 by 2044

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 proposedNone recorded

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was 410th Ave. over Harts Mill Creek built?

It was built in 1995, making it 30 years old in 2025.

What condition is 410th Ave. over Harts Mill Creek 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 May 2024.

How much traffic does 410th Ave. over Harts Mill Creek carry?

About 21 vehicles per day (2022 count).

How long is 410th Ave. over Harts Mill Creek?

The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 24 ft wide.

Who owns 410th Ave. over Harts Mill Creek?

It is owned by the County Highway Agency.