US Bridges

I 29 NB over Floyd River

Fair

Woodbury County, Iowa · 3.5 Mi. N of N Jct. US 75 · Structure no. 000000000700305

Built
2016
9 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
653 ft
6 main spans
Daily traffic
17,200
2022 count
Owner
State
State Highway Agency

About this bridge

I 29 NB over Floyd River is a prestressed concrete stringer/multi-beam or girder carrying I 29 NB over Floyd River in Woodbury County, Iowa. It was built in 2016, so it is 9 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 17,200 vehicles a day, roughly 19% of them trucks, projected to reach 17,200 by 2044. The structure is 653 ft (199.1 m) long and 65 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI 29 NB
CrossesFloyd River
Location3.5 Mi. N of N Jct. US 75
RouteInterstate 29
CountyWoodbury County
StateIowa
Coordinates42.48324, -96.39067
Functional classUrban Principal Arterial - Interstate

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHL 93
Structure length653 ft (199.1 m)
Longest span126 ft (38.3 m)
Deck width65 ft (19.7 m)
Roadway width61 ft (18.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,200 (2022)
Projected traffic17,200 by 2044
Trucks19%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 29 NB over Floyd River built?

It was built in 2016, making it 9 years old in 2025.

What condition is I 29 NB 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 August 2024.

How much traffic does I 29 NB over Floyd River carry?

About 17,200 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is I 29 NB over Floyd River?

The structure is 653 ft (199.1 m) long with a longest span of 126 ft (38.3 m) and a deck 65 ft wide.

Who owns I 29 NB over Floyd River?

It is owned by the State Highway Agency.