B63 490th ST over DD84

Good

Palo Alto County, Iowa · 094342601 · Structure no. 000000000269051

Built: 2021; 4 years old
Condition: Good; inspected May 2023
Type: Slab; Concrete Continuous
Length: 103 ft; 3 main spans
Daily traffic: 309; 2022 count
Owner: County; County Highway Agency

About this bridge

B63 490th ST over DD84 is a concrete continuous slab carrying B63 490th ST over DD84 in Palo Alto County, Iowa. It was built in 2021, so it is 4 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 309 vehicles a day, roughly 18% of them trucks, projected to reach 309 by 2043. The structure is 103 ft (31.4 m) long and 33 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesB63 490th ST

CrossesDD84

Location094342601

RouteCounty Highway 0

CountyPalo Alto County

StateIowa

Coordinates42.93815, -94.82636

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	9 Excellent	No problems noted.
Superstructure	9 Excellent	No problems noted.
Substructure	8 Very Good	No problems noted.
Channel and channel protection	8 Very Good	No problems noted.

Last inspectionMay 2023

Inspection intervalevery 24 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 rating74 US tons

Inventory rating44.3 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHL 93

Structure length103 ft (31.4 m)

Longest span39 ft (11.9 m)

Deck width33 ft (10.1 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic309 (2022)

Projected traffic309 by 2043

Trucks18%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed1.9 mi (3 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—

NavigationNot applicable (no waterway)

Frequently asked questions

When was B63 490th ST over DD84 built?

It was built in 2021, making it 4 years old in 2025.

What condition is B63 490th ST over DD84 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 2023.

How much traffic does B63 490th ST over DD84 carry?

About 309 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is B63 490th ST over DD84?

The structure is 103 ft (31.4 m) long with a longest span of 39 ft (11.9 m) and a deck 33 ft wide.

Who owns B63 490th ST over DD84?

It is owned by the County Highway Agency.