US Bridges

480th ST over Willow Creek

Good

O'Brien County, Iowa · 094 40 20 01 10 · Structure no. 000000000258921

Built
2018
7 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
71 ft
1 main span
Daily traffic
15
2022 count
Owner
County
County Highway Agency

About this bridge

480th ST over Willow Creek is a steel stringer/multi-beam or girder carrying 480th ST over Willow Creek in O'Brien County, Iowa. It was built in 2018, so it is 7 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 15 vehicles a day, projected to reach 15 by 2043. The structure is 71 ft (21.6 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries480th ST
CrossesWillow Creek
Location094 40 20 01 10
RouteCounty Highway 0
CountyO'Brien County
StateIowa
Coordinates42.95367, -95.58612
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40 US tons
Inventory rating30.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length71 ft (21.6 m)
Longest span69 ft (21 m)
Deck width27 ft (8.2 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2022)
Projected traffic15 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$50,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 480th ST over Willow Creek built?

It was built in 2018, making it 7 years old in 2025.

What condition is 480th ST 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 June 2023.

How much traffic does 480th ST over Willow Creek carry?

About 15 vehicles per day (2022 count).

How long is 480th ST over Willow Creek?

The structure is 71 ft (21.6 m) long with a longest span of 69 ft (21 m) and a deck 27 ft wide.

Who owns 480th ST over Willow Creek?

It is owned by the County Highway Agency.