FM over Coal Creek

Fair

Warren County, Iowa · 076222306 · Structure no. 000000000334271

Built: 1984; 41 years old
Condition: Fair; inspected October 2024
Type: Slab; Concrete Continuous
Length: 116 ft; 3 main spans
Daily traffic: 439; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Coal Creek is a concrete continuous slab carrying FM over Coal Creek in Warren County, Iowa. It was built in 1984, so it is 41 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 439 vehicles a day, roughly 14% of them trucks, projected to reach 439 by 2044. The structure is 116 ft (35.4 m) long and 33 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesFM

CrossesCoal Creek

Location076222306

RouteCounty Highway 0

CountyWarren County

StateIowa

Coordinates41.36394, -93.35735

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	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionOctober 2024

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 alignment7: Better than present minimum criteria

Operating rating53.2 US tons

Inventory rating32 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length116 ft (35.4 m)

Longest span44 ft (13.4 m)

Deck width33 ft (10.1 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic439 (2022)

Projected traffic439 by 2044

Trucks14%

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 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 Coal Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is FM over Coal 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 October 2024.

How much traffic does FM over Coal Creek carry?

About 439 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is FM over Coal Creek?

The structure is 116 ft (35.4 m) long with a longest span of 44 ft (13.4 m) and a deck 33 ft wide.

Who owns FM over Coal Creek?

It is owned by the County Highway Agency.