US Bridges

FM over Iowa River

Poor

Tama County, Iowa · 082132002 · Structure no. 000000000316610

Built
1968
57 years old
Condition
Poor
inspected October 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
505 ft
5 main spans
Daily traffic
786
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Iowa River is a steel continuous girder and floorbeam system carrying FM over Iowa River in Tama County, Iowa. It was built in 1968, so it is 57 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 786 vehicles a day, roughly 12% of them trucks, projected to reach 786 by 2044. The structure is 505 ft (153.9 m) long and 30 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

Open in Google Maps
CarriesFM
CrossesIowa River
Location082132002
RouteCounty Highway 0
CountyTama County
StateIowa
Coordinates41.90538, -92.39445
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 protection6 SatisfactoryStructural 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating52.2 US tons
Inventory rating34.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length505 ft (153.9 m)
Longest span110 ft (33.5 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic786 (2022)
Projected traffic786 by 2044
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed21.7 mi (35 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 Iowa River built?

It was built in 1968, making it 57 years old in 2025.

What condition is FM over Iowa 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 October 2024.

How much traffic does FM over Iowa River carry?

About 786 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is FM over Iowa River?

The structure is 505 ft (153.9 m) long with a longest span of 110 ft (33.5 m) and a deck 30 ft wide.

Who owns FM over Iowa River?

It is owned by the County Highway Agency.