US Bridges

FM over Cedar River

Poor

Benton County, Iowa · 085091106 · Structure no. 000000000072430

Built
1969
56 years old
Condition
Poor
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,034 ft
11 main spans
Daily traffic
1,267
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Cedar River is a steel continuous stringer/multi-beam or girder carrying FM over Cedar River in Benton County, Iowa. It was built in 1969, so it is 56 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 1,267 vehicles a day, roughly 15% of them trucks, projected to reach 1,267 by 2043. The structure is 1,034 ft (315.2 m) long and 30 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

CarriesFM
CrossesCedar River
Location085091106
RouteCounty Highway 0
StateIowa
Coordinates42.1853, -91.87241
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50.3 US tons
Inventory rating32.8 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans11
Design loadH 20
Structure length1,034 ft (315.2 m)
Longest span97 ft (29.6 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,267 (2022)
Projected traffic1,267 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Cedar River built?

It was built in 1969, making it 56 years old in 2025.

What condition is FM over 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 April 2023.

How much traffic does FM over Cedar River carry?

About 1,267 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is FM over Cedar River?

The structure is 1,034 ft (315.2 m) long with a longest span of 97 ft (29.6 m) and a deck 30 ft wide.

Who owns FM over Cedar River?

It is owned by the County Highway Agency.