US Bridges

480th ST over Crooked Creek

Good

Pocahontas County, Iowa · 092311601 · Structure no. 000000000279281

Built
2024
1 years old
Condition
Good
inspected November 2024
Type
Culvert
Steel
Length
30 ft
3 main spans
Daily traffic
5
2023 count
Owner
County
County Highway Agency

About this bridge

480th ST over Crooked Creek is a steel culvert carrying 480th ST over Crooked Creek in Pocahontas County, Iowa. It was built in 2024, so it is 1 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5 vehicles a day, projected to reach 5 by 2043. The structure is 30 ft (9.1 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries480th ST
CrossesCrooked Creek
Location092311601
RouteCounty Highway 0
CountyPocahontas County
StateIowa
Coordinates42.79063, -94.51829
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
Channel and channel protection7 GoodSome minor problems.
Culvert9 ExcellentNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation9: Superior to present desirable criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span10 ft (3 m)
Deck width30 ft (9.1 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5 (2023)
Projected traffic5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was 480th ST over Crooked Creek built?

It was built in 2024, making it 1 years old in 2025.

What condition is 480th ST over Crooked 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 November 2024.

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

About 5 vehicles per day (2023 count).

How long is 480th ST over Crooked Creek?

The structure is 30 ft (9.1 m) long with a longest span of 10 ft (3 m) and a deck 30 ft wide.

Who owns 480th ST over Crooked Creek?

It is owned by the County Highway Agency.