US Bridges

B55 430th ST over Dd #61

Good

Palo Alto County, Iowa · 095312601 · Structure no. 000000000269161

Built
2016
9 years old
Condition
Good
inspected May 2024
Type
Slab
Concrete Continuous
Length
83 ft
3 main spans
Daily traffic
478
2022 count
Owner
County
County Highway Agency

About this bridge

B55 430th ST over Dd #61 is a concrete continuous slab carrying B55 430th ST over Dd #61 in Palo Alto County, Iowa. It was built in 2016, so it is 9 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 478 vehicles a day, projected to reach 478 by 2044. The structure is 83 ft (25.3 m) long and 33 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesB55 430th ST
CrossesDd #61
Location095312601
RouteCounty Highway 0
CountyPalo Alto County
StateIowa
Coordinates43.02388, -94.46724
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.3 US tons
Inventory rating42.5 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length83 ft (25.3 m)
Longest span31 ft (9.4 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic478 (2022)
Projected traffic478 by 2044
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 B55 430th ST over Dd #61 built?

It was built in 2016, making it 9 years old in 2025.

What condition is B55 430th ST over Dd #61 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 B55 430th ST over Dd #61 carry?

About 478 vehicles per day (2022 count).

How long is B55 430th ST over Dd #61?

The structure is 83 ft (25.3 m) long with a longest span of 31 ft (9.4 m) and a deck 33 ft wide.

Who owns B55 430th ST over Dd #61?

It is owned by the County Highway Agency.