US Bridges

FM over Upper Iowa River

PoorPosted for load

Winneshiek County, Iowa · 100102105 · Structure no. 000000000349860

Built
1913
112 years old
Condition
Poor
inspected March 2024
Type
Truss - Thru
Steel
Length
152 ft
1 main span
Daily traffic
39
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Upper Iowa River is a steel truss - thru carrying FM over Upper Iowa River in Winneshiek County, Iowa. It was built in 1913, so it is 112 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. Its operating status is: posted for load restriction.

It carries about 39 vehicles a day, projected to reach 39 by 2044. The structure is 152 ft (46.3 m) long and 16 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesFM
CrossesUpper Iowa River
Location100102105
RouteCounty Highway 0
StateIowa
Coordinates43.46473, -92.03938
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
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 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry8: Equal to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating10.1 US tons
Inventory rating6 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckWood or timber
Main spans1 (+1 approach)
Design loadUnknown
Structure length152 ft (46.3 m)
Longest span120 ft (36.6 m)
Deck width16 ft (4.8 m)
Roadway width16 ft (4.8 m)
Vertical clearance over deck18 ft (5.6 m)

Traffic and service

Average daily traffic39 (2022)
Projected traffic39 by 2044
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
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 Upper Iowa River built?

It was built in 1913, making it 112 years old in 2025.

What condition is FM over Upper 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 March 2024.

How much traffic does FM over Upper Iowa River carry?

About 39 vehicles per day (2022 count).

How long is FM over Upper Iowa River?

The structure is 152 ft (46.3 m) long with a longest span of 120 ft (36.6 m) and a deck 16 ft wide.

Who owns FM over Upper Iowa River?

It is owned by the County Highway Agency.