FM over Middle Minerva Creek

Fair

Marshall County, Iowa · 084200403 · Structure no. 000000000243741

Built: 2005; 20 years old
Condition: Fair; inspected November 2023
Type: Slab; Concrete Continuous
Length: 153 ft; 3 main spans
Daily traffic: 147; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Middle Minerva Creek is a concrete continuous slab carrying FM over Middle Minerva Creek in Marshall County, Iowa. It was built in 2005, so it is 20 years old, younger 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 147 vehicles a day, roughly 20% of them trucks, projected to reach 147 by 2043. The structure is 153 ft (46.6 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFM

CrossesMiddle Minerva Creek

Location084200403

RouteCounty Highway 0

CountyMarshall County

StateIowa

Coordinates42.12225, -93.1855

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	7 Good	Some minor problems.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	8 Very Good	No problems noted.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionNovember 2023

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour within limits of footing or piles

Structural evaluation6: Equal to present minimum criteria

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating77.8 US tons

Inventory rating46.6 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length153 ft (46.6 m)

Longest span58 ft (17.7 m)

Deck width32 ft (9.8 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic147 (2022)

Projected traffic147 by 2043

Trucks20%

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 proposedOther structural work, including hydraulic replacements

Estimated improvement cost$30,000 (2024 estimate)

NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Middle Minerva Creek built?

It was built in 2005, making it 20 years old in 2025.

What condition is FM over Middle Minerva 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 November 2023.

How much traffic does FM over Middle Minerva Creek carry?

About 147 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is FM over Middle Minerva Creek?

The structure is 153 ft (46.6 m) long with a longest span of 58 ft (17.7 m) and a deck 32 ft wide.

Who owns FM over Middle Minerva Creek?

It is owned by the County Highway Agency.