US Bridges

Ia 404 SB over Floyd River

Fair

Plymouth County, Iowa · 0.4 Mi. N of Jct. Ia 3 · Structure no. 000000000039640

Built
1957
68 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
353 ft
5 main spans
Daily traffic
2,400
2023 count
Owner
State
State Highway Agency

About this bridge

Ia 404 SB over Floyd River is a steel continuous stringer/multi-beam or girder carrying Ia 404 SB over Floyd River in Plymouth County, Iowa. It was built in 1957, so it is 68 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 2,400 vehicles a day, roughly 7% of them trucks, projected to reach 2,400 by 2043. The structure is 353 ft (107.6 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesIa 404 SB
CrossesFloyd River
Location0.4 Mi. N of Jct. Ia 3
RouteState Highway 404
CountyPlymouth County
StateIowa
Coordinates42.80085, -96.17452
Functional classUrban 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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.6 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length353 ft (107.6 m)
Longest span77 ft (23.5 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,400 (2023)
Projected traffic2,400 by 2043
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 404 SB over Floyd River built?

It was built in 1957, making it 68 years old in 2025.

What condition is Ia 404 SB over Floyd 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 404 SB over Floyd River carry?

About 2,400 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is Ia 404 SB over Floyd River?

The structure is 353 ft (107.6 m) long with a longest span of 77 ft (23.5 m) and a deck 34 ft wide.

Who owns Ia 404 SB over Floyd River?

It is owned by the State Highway Agency.