580th ST over Powell Creek

Fair

Buena Vista County, Iowa · 091373001 · Structure no. 000000000085251

Built: 1972; 53 years old
Condition: Fair; inspected August 2024
Type: Culvert; Concrete Continuous
Length: 31 ft; 3 main spans
Daily traffic: 429; 2022 count
Owner: County; County Highway Agency

About this bridge

580th ST over Powell Creek is a concrete continuous culvert carrying 580th ST over Powell Creek in Buena Vista County, Iowa. It was built in 1972, so it is 53 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 429 vehicles a day, roughly 11% of them trucks, projected to reach 429 by 2044. The structure is 31 ft (9.4 m) long. If it were closed, the detour would be 3.1 mi (5 km).

Location

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Carries580th ST

CrossesPowell Creek

Location091373001

RouteCounty Highway 0

CountyBuena Vista County

StateIowa

Coordinates42.67656, -95.26993

Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

Component	Rating	Meaning
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.
Culvert	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionAugust 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is

Approach roadway alignment8: Equal to present desirable criteria

Operating rating51.7 US tons

Inventory rating31 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans3

Design loadH 20

Structure length31 ft (9.4 m)

Longest span10 ft (3 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic429 (2022)

Projected traffic429 by 2044

Trucks11%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed3.1 mi (5 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 580th ST over Powell Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is 580th ST over Powell Creek 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 580th ST over Powell Creek carry?

About 429 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is 580th ST over Powell Creek?

The structure is 31 ft (9.4 m) long with a longest span of 10 ft (3 m).

Who owns 580th ST over Powell Creek?

It is owned by the County Highway Agency.