FM-N-36 over Creek

Fair

Audubon County, Iowa · 079341504 · Structure no. 000000000067340

Built: 1975; 50 years old
Condition: Fair; inspected June 2024
Type: Slab; Concrete Continuous
Length: 78 ft; 3 main spans
Daily traffic: 278; 2022 count
Owner: County; County Highway Agency

About this bridge

FM-N-36 over Creek is a concrete continuous slab carrying FM-N-36 over Creek in Audubon County, Iowa. It was built in 1975, so it is 50 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 278 vehicles a day, roughly 22% of them trucks, projected to reach 278 by 2044. The structure is 78 ft (23.8 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps

CarriesFM-N-36

CrossesCreek

Location079341504

RouteCounty Highway 0

CountyAudubon County

StateIowa

Coordinates41.65343, -94.80212

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
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	7 Good	Some minor problems.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionJune 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is

Operating rating65.5 US tons

Inventory rating43 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length78 ft (23.8 m)

Longest span29 ft (8.8 m)

Deck width32 ft (9.8 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic278 (2022)

Projected traffic278 by 2044

Trucks22%

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 proposedNone recorded

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was FM-N-36 over Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is FM-N-36 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 FM-N-36 over Creek carry?

About 278 vehicles per day (2022 count), of which roughly 22% are trucks.

How long is FM-N-36 over Creek?

The structure is 78 ft (23.8 m) long with a longest span of 29 ft (8.8 m) and a deck 32 ft wide.

Who owns FM-N-36 over Creek?

It is owned by the County Highway Agency.