US Bridges

FM over Iowa River

FairPosted for load

Tama County, Iowa · 082140406 · Structure no. 000000000316700

Built
1941
84 years old
Condition
Fair
inspected October 2024
Type
Truss - Thru
Steel
Length
503 ft
1 main span
Daily traffic
59
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Iowa River is a steel truss - thru carrying FM over Iowa River in Tama County, Iowa. It was built in 1941, so it is 84 years old, older 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. Its operating status is: posted for load restriction.

It carries about 59 vehicles a day, projected to reach 59 by 2044. The structure is 503 ft (153.3 m) long and 23 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesFM
CrossesIowa River
Location082140406
RouteCounty Highway 0
CountyTama County
StateIowa
Coordinates41.93904, -92.47843
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be 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 rating27.7 US tons
Inventory rating14.1 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+6 approach)
Design loadH 15
Structure length503 ft (153.3 m)
Longest span140 ft (42.7 m)
Deck width23 ft (7.1 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deck14 ft (4.4 m)

Traffic and service

Average daily traffic59 (2022)
Projected traffic59 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 1941, making it 84 years old in 2025.

What condition is FM over Iowa River 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 Iowa River carry?

About 59 vehicles per day (2022 count).

How long is FM over Iowa River?

The structure is 503 ft (153.3 m) long with a longest span of 140 ft (42.7 m) and a deck 23 ft wide.

Who owns FM over Iowa River?

It is owned by the County Highway Agency.