FM over Stony Creek

Fair

Dickinson County, Iowa · 098380701 · Structure no. 000000000144891

Built: 1977; 48 years old
Condition: Fair; inspected April 2023
Type: Slab; Concrete Continuous
Length: 77 ft; 3 main spans
Daily traffic: 934; 2021 count
Owner: County; County Highway Agency

About this bridge

FM over Stony Creek is a concrete continuous slab carrying FM over Stony Creek in Dickinson County, Iowa. It was built in 1977, so it is 48 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 934 vehicles a day, roughly 17% of them trucks, projected to reach 934 by 2043. The structure is 77 ft (23.5 m) long and 32 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesFM

CrossesStony Creek

Location098380701

RouteCounty Highway 0

CountyDickinson County

StateIowa

Coordinates43.3277, -95.37869

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 inspectionApril 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 adequacy7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating57.8 US tons

Inventory rating36.4 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length77 ft (23.5 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 traffic934 (2021)

Projected traffic934 by 2043

Trucks17%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed14.3 mi (23 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—

NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Stony Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is FM over Stony 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 April 2023.

How much traffic does FM over Stony Creek carry?

About 934 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is FM over Stony Creek?

The structure is 77 ft (23.5 m) long with a longest span of 29 ft (8.8 m) and a deck 32 ft wide.

Who owns FM over Stony Creek?

It is owned by the County Highway Agency.