US Bridges

46th ST over Floyd River

Fair

Woodbury County, Iowa · 000000000 · Structure no. 000000000010710

Built
1964
61 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
387 ft
4 main spans
Daily traffic
1,723
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

46th ST over Floyd River is a steel continuous stringer/multi-beam or girder carrying 46th ST over Floyd River in Woodbury County, Iowa. It was built in 1964, so it is 61 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 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 1,723 vehicles a day, roughly 4% of them trucks, projected to reach 1,723 by 2043. The structure is 387 ft (118 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries46th ST
CrossesFloyd River
Location000000000
RouteCity Street 0
CountyWoodbury County
StateIowa
Coordinates42.54743, -96.33645
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating70.5 US tons
Inventory rating42.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length387 ft (118 m)
Longest span108 ft (32.9 m)
Deck width34 ft (10.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,723 (2021)
Projected traffic1,723 by 2043
Trucks4%
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

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 46th ST over Floyd River built?

It was built in 1964, making it 61 years old in 2025.

What condition is 46th ST 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 46th ST over Floyd River carry?

About 1,723 vehicles per day (2021 count), of which roughly 4% are trucks.

How long is 46th ST over Floyd River?

The structure is 387 ft (118 m) long with a longest span of 108 ft (32.9 m) and a deck 34 ft wide.

Who owns 46th ST over Floyd River?

It is owned by the City or Municipal Highway Agency.