FM over Tangen Creek

Fair

Winneshiek County, Iowa · 096082804 · Structure no. 000000000346160

Built: 1935; 90 years old
Condition: Fair; inspected April 2023
Type: Arch - Deck; Concrete
Length: 58 ft; 1 main span
Daily traffic: 59; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Tangen Creek is a concrete arch - deck carrying FM over Tangen Creek in Winneshiek County, Iowa. It was built in 1935, so it is 90 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 59 vehicles a day, projected to reach 59 by 2043. The structure is 58 ft (17.7 m) long and 26 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesFM

CrossesTangen Creek

Location096082804

RouteCounty Highway 0

CountyWinneshiek County

StateIowa

Coordinates43.10349, -91.80377

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	7 Good	Some minor problems.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionApril 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourCountermeasures installed to correct a previously existing problem

Structural evaluation6: Equal to present minimum criteria

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 rating46.7 US tons

Inventory rating36 US tons

Structure

Structure typeArch - Deck

MaterialConcrete

DeckConcrete, cast-in-place

Main spans1

Design loadUnknown

Structure length58 ft (17.7 m)

Longest span50 ft (15.2 m)

Deck width26 ft (7.9 m)

Roadway width22 ft (6.7 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic59 (2022)

Projected traffic59 by 2043

Trucks0%

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 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 Tangen Creek built?

It was built in 1935, making it 90 years old in 2025.

What condition is FM over Tangen Creek 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 2023.

How much traffic does FM over Tangen Creek carry?

About 59 vehicles per day (2022 count).

How long is FM over Tangen Creek?

The structure is 58 ft (17.7 m) long with a longest span of 50 ft (15.2 m) and a deck 26 ft wide.

Who owns FM over Tangen Creek?

It is owned by the County Highway Agency.