270th ST over Creek

Fair

Audubon County, Iowa · 079353101 · Structure no. 000000000067720

Built: 1957; 68 years old
Condition: Fair; inspected June 2024
Type: Channel Beam; Concrete
Length: 68 ft; 2 main spans
Daily traffic: 20; 2022 count
Owner: County; County Highway Agency

About this bridge

270th ST over Creek is a concrete channel beam carrying 270th ST over Creek in Audubon County, Iowa. It was built in 1957, so it is 68 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 20 vehicles a day, projected to reach 20 by 2044. The structure is 68 ft (20.7 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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Carries270th ST

CrossesCreek

Location079353101

RouteCounty Highway 0

CountyAudubon County

StateIowa

Coordinates41.61629, -94.96529

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
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionJune 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation4: Meets minimum tolerable limits to be left in place as is

Deck geometry4: Meets minimum tolerable limits to be left in place as is

Waterway adequacy6: Equal to present minimum criteria

Approach roadway alignment6: Equal to present minimum criteria

Operating rating26.7 US tons

Inventory rating14.9 US tons

Structure

Structure typeChannel Beam

MaterialConcrete

DeckConcrete, precast panels

Main spans2

Design loadH 15

Structure length68 ft (20.7 m)

Longest span43 ft (13.1 m)

Deck width20 ft (6.1 m)

Roadway width19 ft (5.9 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2022)

Projected traffic20 by 2044

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was 270th ST over Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is 270th ST over 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 June 2024.

How much traffic does 270th ST over Creek carry?

About 20 vehicles per day (2022 count).

How long is 270th ST over Creek?

The structure is 68 ft (20.7 m) long with a longest span of 43 ft (13.1 m) and a deck 20 ft wide.

Who owns 270th ST over Creek?

It is owned by the County Highway Agency.