FM over DD175

Fair

Palo Alto County, Iowa · 095330401 · Structure no. 000000000269341

Built: 1977; 48 years old
Condition: Fair; inspected April 2023
Type: Slab; Concrete Continuous
Length: 91 ft; 3 main spans
Daily traffic: 81; 2021 count
Owner: County; County Highway Agency

About this bridge

FM over DD175 is a concrete continuous slab carrying FM over DD175 in Palo Alto County, Iowa. It was built in 1977, so it is 48 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 81 vehicles a day, projected to reach 81 by 2043. The structure is 91 ft (27.7 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesFM

CrossesDD175

Location095330401

RouteCounty Highway 0

CountyPalo Alto County

StateIowa

Coordinates43.08307, -94.75295

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	6 Satisfactory	Structural elements show some minor deterioration.
Channel and channel protection	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.

Last inspectionApril 2023

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 adequacy9: Superior to present desirable criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating53.5 US tons

Inventory rating33.5 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadH 20

Structure length91 ft (27.7 m)

Longest span34 ft (10.4 m)

Deck width32 ft (9.8 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81 (2021)

Projected traffic81 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 statusNot eligible for the National Register of Historic Places

Work proposedOther structural work, including hydraulic replacements

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was FM over DD175 built?

It was built in 1977, making it 48 years old in 2025.

What condition is FM over DD175 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 DD175 carry?

About 81 vehicles per day (2021 count).

How long is FM over DD175?

The structure is 91 ft (27.7 m) long with a longest span of 34 ft (10.4 m) and a deck 32 ft wide.

Who owns FM over DD175?

It is owned by the County Highway Agency.