US Bridges

B63 (490th St) over Dd 63

Good

Palo Alto County, Iowa · 094332901 · Structure no. 000000000268951

Built
2014
11 years old
Condition
Good
inspected May 2022
Type
Slab
Concrete Continuous
Length
84 ft
3 main spans
Daily traffic
309
2022 count
Owner
County
County Highway Agency

About this bridge

B63 (490th St) over Dd 63 is a concrete continuous slab carrying B63 (490th St) over Dd 63 in Palo Alto County, Iowa. It was built in 2014, so it is 11 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 84 ft (25.5 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesB63 (490th St)
CrossesDd 63
Location094332901
RouteCounty Highway 0
CountyPalo Alto County
StateIowa
Coordinates42.93809, -94.77256
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 2022
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 adequacy7: Better than present minimum 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 length84 ft (25.5 m)
Longest span31 ft (9.4 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 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 closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was B63 (490th St) over Dd 63 built?

It was built in 2014, making it 11 years old in 2025.

What condition is B63 (490th St) over Dd 63 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 2022.

How much traffic does B63 (490th St) over Dd 63 carry?

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

How long is B63 (490th St) over Dd 63?

The structure is 84 ft (25.5 m) long with a longest span of 31 ft (9.4 m) and a deck 33 ft wide.

Who owns B63 (490th St) over Dd 63?

It is owned by the County Highway Agency.