US Bridges

Ia 175 over Raccoon River

Fair

Calhoun County, Iowa · 1.8 Mi. E of JCT SR N28 · Structure no. 000000000016991

Built
1980
45 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
294 ft
3 main spans
Daily traffic
1,560
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 175 over Raccoon River is a prestressed concrete stringer/multi-beam or girder carrying Ia 175 over Raccoon River 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 2042. The structure is 294 ft (89.6 m) long and 43 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIa 175
CrossesRaccoon River
Location1.8 Mi. E of JCT SR N28
RouteState Highway 175
CountyCalhoun County
StateIowa
Coordinates42.26026, -94.82621
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.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
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 alignment7: Better than present minimum criteria
Operating rating99.8 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length294 ft (89.6 m)
Longest span97 ft (29.6 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,560 (2022)
Projected traffic1,560 by 2042
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Raccoon River built?

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

What condition is Ia 175 over Raccoon 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 2023.

How much traffic does Ia 175 over Raccoon River carry?

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

How long is Ia 175 over Raccoon River?

The structure is 294 ft (89.6 m) long with a longest span of 97 ft (29.6 m) and a deck 43 ft wide.

Who owns Ia 175 over Raccoon River?

It is owned by the State Highway Agency.