US Bridges

FM over Upper Iowa River

Fair

Allamakee County, Iowa · 099060806 · Structure no. 000000000062885

Built
1974
51 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
317 ft
4 main spans
Daily traffic
69
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Upper Iowa River is a steel continuous stringer/multi-beam or girder carrying FM over Upper Iowa River in Allamakee County, Iowa. It was built in 1974, so it is 51 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 69 vehicles a day, projected to reach 69 by 2044. The structure is 317 ft (96.6 m) long and 32 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

Open in Google Maps
CarriesFM
CrossesUpper Iowa River
Location099060806
RouteCounty Highway 0
CountyAllamakee County
StateIowa
Coordinates43.41217, -91.57614
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating43.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length317 ft (96.6 m)
Longest span88 ft (26.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic69 (2022)
Projected traffic69 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Upper Iowa River built?

It was built in 1974, making it 51 years old in 2025.

What condition is FM over Upper 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 April 2024.

How much traffic does FM over Upper Iowa River carry?

About 69 vehicles per day (2022 count).

How long is FM over Upper Iowa River?

The structure is 317 ft (96.6 m) long with a longest span of 88 ft (26.8 m) and a deck 32 ft wide.

Who owns FM over Upper Iowa River?

It is owned by the County Highway Agency.