US Bridges

FM over West Fork Cedar River

Poor

Butler County, Iowa · 091170802 · Structure no. 000000000087820

Built
1970
55 years old
Condition
Poor
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
492 ft
6 main spans
Daily traffic
373
2022 count
Owner
County
County Highway Agency

About this bridge

FM over West Fork Cedar River is a steel continuous stringer/multi-beam or girder carrying FM over West Fork Cedar River in Butler County, Iowa. It was built in 1970, so it is 55 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 373 vehicles a day, roughly 21% of them trucks, projected to reach 373 by 2043. The structure is 492 ft (150 m) long and 30 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesFM
CrossesWest Fork Cedar River
Location091170802
RouteCounty Highway 0
StateIowa
Coordinates42.70314, -92.88897
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 rating43.4 US tons
Inventory rating30.1 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadH 20
Structure length492 ft (150 m)
Longest span88 ft (26.8 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic373 (2022)
Projected traffic373 by 2043
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$1.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over West Fork Cedar River built?

It was built in 1970, making it 55 years old in 2025.

What condition is FM over West Fork Cedar River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

How much traffic does FM over West Fork Cedar River carry?

About 373 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is FM over West Fork Cedar River?

The structure is 492 ft (150 m) long with a longest span of 88 ft (26.8 m) and a deck 30 ft wide.

Who owns FM over West Fork Cedar River?

It is owned by the County Highway Agency.