FM over Dd 84

Good

Palo Alto County, Iowa · 094342302 · Structure no. 000000000269021

Built: 2002; 23 years old
Condition: Good; inspected May 2024
Type: Slab; Concrete Continuous
Length: 94 ft; 3 main spans
Daily traffic: 1,008; 2022 count
Owner: County; County Highway Agency

About this bridge

FM over Dd 84 is a concrete continuous slab carrying FM over Dd 84 in Palo Alto County, Iowa. It was built in 2002, so it is 23 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,008 vehicles a day, roughly 23% of them trucks, projected to reach 1,008 by 2044. The structure is 94 ft (28.7 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesFM

CrossesDd 84

Location094342302

RouteCounty Highway 0

CountyPalo Alto County

StateIowa

Coordinates42.9463, -94.83634

Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

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

Last inspectionMay 2024

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating83.7 US tons

Inventory rating50 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length94 ft (28.7 m)

Longest span34 ft (10.4 m)

Deck width33 ft (10.1 m)

Roadway width31 ft (9.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,008 (2022)

Projected traffic1,008 by 2044

Trucks23%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed3.7 mi (6 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 proposedOther structural work, including hydraulic replacements

Estimated improvement cost—

NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Dd 84 built?

It was built in 2002, making it 23 years old in 2025.

What condition is FM over Dd 84 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does FM over Dd 84 carry?

About 1,008 vehicles per day (2022 count), of which roughly 23% are trucks.

How long is FM over Dd 84?

The structure is 94 ft (28.7 m) long with a longest span of 34 ft (10.4 m) and a deck 33 ft wide.

Who owns FM over Dd 84?

It is owned by the County Highway Agency.