US Bridges

Ia 9 over Willow Creek

Good

Worth County, Iowa · 0.3 Miles W of Jct. I-35 · Structure no. 000000000054021

Built
2004
21 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
94 ft
1 main span
Daily traffic
1,960
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 9 over Willow Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 9 over Willow Creek in Worth County, Iowa. It was built in 2004, so it is 21 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,960 vehicles a day, roughly 23% of them trucks, projected to reach 1,960 by 2043. The structure is 94 ft (28.7 m) long and 47 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesIa 9
CrossesWillow Creek
Location0.3 Miles W of Jct. I-35
RouteState Highway 9
StateIowa
Coordinates43.2845, -93.35678
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.5 US tons
Inventory rating42.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length94 ft (28.7 m)
Longest span87 ft (26.5 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,960 (2022)
Projected traffic1,960 by 2043
Trucks23%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Ia 9 over Willow Creek built?

It was built in 2004, making it 21 years old in 2025.

What condition is Ia 9 over Willow Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does Ia 9 over Willow Creek carry?

About 1,960 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is Ia 9 over Willow Creek?

The structure is 94 ft (28.7 m) long with a longest span of 87 ft (26.5 m) and a deck 47 ft wide.

Who owns Ia 9 over Willow Creek?

It is owned by the State Highway Agency.