FM over Big Minerva Creek

Fair

Marshall County, Iowa · 085202606 · Structure no. 000000000244541

Built: 1999; 26 years old
Condition: Fair; inspected November 2023
Type: Slab; Concrete Continuous
Length: 153 ft; 3 main spans
Daily traffic: 187; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Big Minerva Creek is a concrete continuous slab carrying FM over Big Minerva Creek in Marshall County, Iowa. It was built in 1999, so it is 26 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 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 187 vehicles a day, roughly 24% of them trucks, projected to reach 187 by 2043. The structure is 153 ft (46.6 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesFM

CrossesBig Minerva Creek

Location085202606

RouteCounty Highway 0

CountyMarshall County

StateIowa

Coordinates42.13891, -93.15606

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	7 Good	Some minor problems.

Last inspectionNovember 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 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 span59 ft (18 m)

Deck width33 ft (10.1 m)

Roadway width31 ft (9.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic187 (2022)

Projected traffic187 by 2043

Trucks24%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed6.2 mi (10 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 Big Minerva Creek built?

It was built in 1999, making it 26 years old in 2025.

What condition is FM over Big 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 Big Minerva Creek carry?

About 187 vehicles per day (2022 count), of which roughly 24% are trucks.

How long is FM over Big Minerva Creek?

The structure is 153 ft (46.6 m) long with a longest span of 59 ft (18 m) and a deck 33 ft wide.

Who owns FM over Big Minerva Creek?

It is owned by the County Highway Agency.