US Bridges

FM over Branch Upper Iowa River

Fair

Allamakee County, Iowa · 100053603 · Structure no. 000000000063260

Built
1930
95 years old, rebuilt 1962
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
648
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Branch Upper Iowa River is a concrete slab carrying FM over Branch Upper Iowa River in Allamakee County, Iowa. It was built in 1930 and reconstructed in 1962, so it is 95 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.

It carries about 648 vehicles a day, roughly 11% of them trucks, projected to reach 648 by 2044. The structure is 22 ft (6.7 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFM
CrossesBranch Upper Iowa River
Location100053603
RouteCounty Highway 0
StateIowa
Coordinates43.44231, -91.37936
Functional classRural Major 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 rating25.6 US tons
Inventory rating18.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic648 (2022)
Projected traffic648 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 Branch Upper Iowa River built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1962.

What condition is FM over Branch 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 Branch Upper Iowa River carry?

About 648 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is FM over Branch Upper Iowa River?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns FM over Branch Upper Iowa River?

It is owned by the County Highway Agency.