FM-M-66 over Creek

Fair

Audubon County, Iowa · 080361704 · Structure no. 000000000361260

Built: 1972; 53 years old
Condition: Fair; inspected August 2024
Type: Culvert; Concrete Continuous
Length: 27 ft; 2 main spans
Daily traffic: 338; 2022 count
Owner: County; County Highway Agency

About this bridge

FM-M-66 over Creek is a concrete continuous culvert carrying FM-M-66 over Creek in Audubon 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 338 vehicles a day, roughly 10% of them trucks, projected to reach 338 by 2044. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFM-M-66

CrossesCreek

Location080361704

RouteCounty Highway 0

CountyAudubon County

StateIowa

Coordinates41.73334, -95.07295

Functional classRural Major 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 adequacy6: Equal to present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating110.1 US tons

Inventory rating110.1 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans2

Design loadUnknown

Structure length27 ft (8.2 m)

Longest span12 ft (3.7 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic338 (2022)

Projected traffic338 by 2044

Trucks10%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed5 mi (8 km)

TollOn a free road

National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency

Maintained byCounty Highway Agency

Historic statusPossibly eligible for the National Register; requires further investigation

Work proposedReplacement because of substandard load-carrying capacity or roadway geometry

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was FM-M-66 over Creek built?

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

What condition is FM-M-66 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 August 2024.

How much traffic does FM-M-66 over Creek carry?

About 338 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is FM-M-66 over Creek?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m).

Who owns FM-M-66 over Creek?

It is owned by the County Highway Agency.