Ia 175 over Lake Creek

Fair

Calhoun County, Iowa · 2.0 Mi. W of Jct. SR N37 · Structure no. 000000000017011

Built: 1980; 45 years old
Condition: Fair; inspected October 2024
Type: Slab; Concrete Continuous
Length: 133 ft; 3 main spans
Daily traffic: 1,560; 2022 count
Owner: State; State Highway Agency

About this bridge

Ia 175 over Lake Creek is a concrete continuous slab carrying Ia 175 over Lake Creek in Calhoun County, Iowa. It was built in 1980, so it is 45 years old, younger 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 1,560 vehicles a day, roughly 19% of them trucks, projected to reach 1,560 by 2044. The structure is 133 ft (40.5 m) long and 43 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesIa 175

CrossesLake Creek

Location2.0 Mi. W of Jct. SR N37

RouteState Highway 175

CountyCalhoun County

StateIowa

Coordinates42.26068, -94.78267

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	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	8 Very Good	No problems noted.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionOctober 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 geometry7: Better than present minimum criteria

Waterway adequacy6: Equal to present minimum criteria

Approach roadway alignment6: Equal to present minimum criteria

Operating rating70.4 US tons

Inventory rating42.2 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length133 ft (40.5 m)

Longest span51 ft (15.5 m)

Deck width43 ft (13.1 m)

Roadway width40 ft (12.2 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,560 (2022)

Projected traffic1,560 by 2044

Trucks19%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed8.7 mi (14 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency

Maintained byState 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 Ia 175 over Lake Creek built?

It was built in 1980, making it 45 years old in 2025.

What condition is Ia 175 over Lake Creek 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 October 2024.

How much traffic does Ia 175 over Lake Creek carry?

About 1,560 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is Ia 175 over Lake Creek?

The structure is 133 ft (40.5 m) long with a longest span of 51 ft (15.5 m) and a deck 43 ft wide.

Who owns Ia 175 over Lake Creek?

It is owned by the State Highway Agency.