FM over Moon Creek

FairPosted for load

Mahaska County, Iowa · 077141801 · Structure no. 000000000237755

Built: 1965; 60 years old
Condition: Fair; inspected December 2023
Type: Slab; Concrete Continuous
Length: 153 ft; 3 main spans
Daily traffic: 190; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Moon Creek is a concrete continuous slab carrying FM over Moon Creek in Mahaska County, Iowa. It was built in 1965, so it is 60 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. Its operating status is: posted for load restriction.

It carries about 190 vehicles a day, roughly 15% of them trucks, projected to reach 190 by 2043. The structure is 153 ft (46.6 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesFM

CrossesMoon Creek

Location077141801

RouteCounty Highway 0

CountyMahaska County

StateIowa

Coordinates41.48084, -92.51787

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	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	7 Good	Some minor problems.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionDecember 2023

Inspection intervalevery 24 months

Operating statusPosted for load restriction

ScourFoundations stable; scour above top of footing

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

Deck geometry6: Equal to present minimum criteria

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment6: Equal to present minimum criteria

Operating rating31 US tons

Inventory rating16.1 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length153 ft (46.6 m)

Longest span58 ft (17.7 m)

Deck width34 ft (10.4 m)

Roadway width28 ft (8.6 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic190 (2022)

Projected traffic190 by 2043

Trucks15%

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 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 Moon Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is FM over Moon 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 December 2023.

How much traffic does FM over Moon Creek carry?

About 190 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is FM over Moon Creek?

The structure is 153 ft (46.6 m) long with a longest span of 58 ft (17.7 m) and a deck 34 ft wide.

Who owns FM over Moon Creek?

It is owned by the County Highway Agency.