US Bridges

FM over Dd 98

Good

Palo Alto County, Iowa · 094323005 · Structure no. 000000000268831

Built
2005
20 years old
Condition
Good
inspected July 2023
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
709
2022 count
Owner
County
County Highway Agency

About this bridge

FM over Dd 98 is a concrete continuous slab carrying FM over Dd 98 in Palo Alto County, Iowa. It was built in 2005, so it is 20 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 709 vehicles a day, roughly 15% of them trucks, projected to reach 709 by 2043. The structure is 78 ft (23.8 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesFM
CrossesDd 98
Location094323005
RouteCounty Highway 0
StateIowa
Coordinates42.93786, -94.66277
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.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84.1 US tons
Inventory rating50.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length78 ft (23.8 m)
Longest span29 ft (8.8 m)
Deck width32 ft (9.9 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic709 (2022)
Projected traffic709 by 2043
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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$50,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Dd 98 built?

It was built in 2005, making it 20 years old in 2025.

What condition is FM over Dd 98 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 July 2023.

How much traffic does FM over Dd 98 carry?

About 709 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is FM over Dd 98?

The structure is 78 ft (23.8 m) long with a longest span of 29 ft (8.8 m) and a deck 32 ft wide.

Who owns FM over Dd 98?

It is owned by the County Highway Agency.