Ia 9 over Shell Rock River

Fair

Worth County, Iowa · 0.1 Mi. E of W Jct. S56 · Structure no. 000000000054080

Built: 1921; 104 years old, rebuilt 1959
Condition: Fair; inspected April 2024
Type: Slab; Concrete Continuous
Length: 123 ft; 3 main spans
Daily traffic: 2,160; 2022 count
Owner: State; State Highway Agency

About this bridge

Ia 9 over Shell Rock River is a concrete continuous slab carrying Ia 9 over Shell Rock River in Worth County, Iowa. It was built in 1921 and reconstructed in 1959, so it is 104 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 2,160 vehicles a day, roughly 12% of them trucks, projected to reach 2,160 by 2044. The structure is 123 ft (37.5 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesIa 9

CrossesShell Rock River

Location0.1 Mi. E of W Jct. S56

RouteState Highway 9

CountyWorth County

StateIowa

Coordinates43.28427, -93.12406

Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

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

Last inspectionApril 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour within limits of footing or piles

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry4: Meets minimum tolerable limits to be left in place as is

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating50.6 US tons

Inventory rating30.4 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length123 ft (37.5 m)

Longest span47 ft (14.3 m)

Deck width34 ft (10.4 m)

Roadway width28 ft (8.5 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,160 (2022)

Projected traffic2,160 by 2044

Trucks12%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed6.2 mi (10 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency

Maintained byState Highway Agency

Historic statusPossibly eligible for the National Register; requires further investigation

Work proposedNone recorded

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 9 over Shell Rock River built?

It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1959.

What condition is Ia 9 over Shell Rock River 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 2024.

How much traffic does Ia 9 over Shell Rock River carry?

About 2,160 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is Ia 9 over Shell Rock River?

The structure is 123 ft (37.5 m) long with a longest span of 47 ft (14.3 m) and a deck 34 ft wide.

Who owns Ia 9 over Shell Rock River?

It is owned by the State Highway Agency.