US Bridges

Ia 346 over Cedar River

Fair

Chickasaw County, Iowa · 0.8 MI E of JCT U.S. 218 · Structure no. 000000000019891

Built
1984
41 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
563 ft
7 main spans
Daily traffic
3,340
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 346 over Cedar River is a prestressed concrete stringer/multi-beam or girder carrying Ia 346 over Cedar River in Chickasaw County, Iowa. It was built in 1984, so it is 41 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 6 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 3,340 vehicles a day, roughly 10% of them trucks, projected to reach 3,340 by 2043. The structure is 563 ft (171.6 m) long and 41 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesIa 346
CrossesCedar River
Location0.8 MI E of JCT U.S. 218
RouteState Highway 346
CountyChickasaw County
StateIowa
Coordinates42.95456, -92.53561
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating94 US tons
Inventory rating34.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length563 ft (171.6 m)
Longest span82 ft (25 m)
Deck width41 ft (12.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,340 (2022)
Projected traffic3,340 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed6.8 mi (11 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 346 over Cedar River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Ia 346 over Cedar 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 December 2023.

How much traffic does Ia 346 over Cedar River carry?

About 3,340 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Ia 346 over Cedar River?

The structure is 563 ft (171.6 m) long with a longest span of 82 ft (25 m) and a deck 41 ft wide.

Who owns Ia 346 over Cedar River?

It is owned by the State Highway Agency.