FM over Johnny Creek

Fair

Louisa County, Iowa · 074040702 · Structure no. 000000000224040

Built: 1970; 55 years old
Condition: Fair; inspected June 2023
Type: Culvert; Concrete Continuous
Length: 29 ft; 2 main spans
Daily traffic: 50; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Johnny Creek is a concrete continuous culvert carrying FM over Johnny Creek in Louisa County, Iowa. It was built in 1970, so it is 55 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 5 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 50 vehicles a day, projected to reach 50 by 2043. The structure is 29 ft (8.8 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFM

CrossesJohnny Creek

Location074040702

RouteCounty Highway 0

CountyLouisa County

StateIowa

Coordinates41.22591, -91.36999

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	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionJune 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry6: Equal to present minimum criteria

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

Approach roadway alignment6: Equal to present minimum criteria

Operating rating72.9 US tons

Inventory rating43.7 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans2

Design loadUnknown

Structure length29 ft (8.8 m)

Longest span15 ft (4.6 m)

Deck width39 ft (11.9 m)

Roadway width27 ft (8.2 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)

Projected traffic50 by 2043

Trucks0%

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 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 FM over Johnny Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is FM over Johnny 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 2023.

How much traffic does FM over Johnny Creek carry?

About 50 vehicles per day (2022 count).

How long is FM over Johnny Creek?

The structure is 29 ft (8.8 m) long with a longest span of 15 ft (4.6 m) and a deck 39 ft wide.

Who owns FM over Johnny Creek?

It is owned by the County Highway Agency.