FM over Bluff Creek

Fair

Boone County, Iowa · 085272902 · Structure no. 000000000078381

Built: 1987; 38 years old
Condition: Fair; inspected May 2024
Type: Slab; Concrete Continuous
Length: 91 ft; 3 main spans
Daily traffic: 977; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Bluff Creek is a concrete continuous slab carrying FM over Bluff Creek in Boone County, Iowa. It was built in 1987, so it is 38 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 977 vehicles a day, roughly 15% of them trucks, projected to reach 977 by 2044. The structure is 91 ft (27.7 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFM

CrossesBluff Creek

Location085272902

RouteCounty Highway 0

CountyBoone County

StateIowa

Coordinates42.1385, -94.02779

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	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	7 Good	Some minor problems.
Channel and channel protection	7 Good	Some minor problems.

Last inspectionMay 2024

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Deck geometry6: Equal to present minimum criteria

Waterway adequacy7: Better than present minimum criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating68.2 US tons

Inventory rating40 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length91 ft (27.7 m)

Longest span31 ft (9.4 m)

Deck width33 ft (10.1 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic977 (2022)

Projected traffic977 by 2044

Trucks15%

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 proposedOther structural work, including hydraulic replacements

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Bluff Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is FM over Bluff 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 May 2024.

How much traffic does FM over Bluff Creek carry?

About 977 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is FM over Bluff Creek?

The structure is 91 ft (27.7 m) long with a longest span of 31 ft (9.4 m) and a deck 33 ft wide.

Who owns FM over Bluff Creek?

It is owned by the County Highway Agency.