US Bridges

US 63 over Walnut Creek

Good

Poweshiek County, Iowa · 4.1 Mi. N of N Jct. US 6 · Structure no. 000000000045861

Built
1978
47 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
129 ft
3 main spans
Daily traffic
1,820
2022 count
Owner
State
State Highway Agency

About this bridge

US 63 over Walnut Creek is a prestressed concrete stringer/multi-beam or girder carrying US 63 over Walnut Creek in Poweshiek County, Iowa. It was built in 1978, so it is 47 years old, older 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 1,820 vehicles a day, roughly 24% of them trucks, projected to reach 1,820 by 2044. The structure is 129 ft (39.3 m) long and 47 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

CarriesUS 63
CrossesWalnut Creek
Location4.1 Mi. N of N Jct. US 6
RouteU.S. Route 63
StateIowa
Coordinates41.80507, -92.59137
Functional classRural Principal Arterial - Other

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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.4 US tons
Inventory rating51.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length129 ft (39.3 m)
Longest span57 ft (17.4 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,820 (2022)
Projected traffic1,820 by 2044
Trucks24%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 63 over Walnut Creek built?

It was built in 1978, making it 47 years old in 2025.

What condition is US 63 over Walnut Creek 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 June 2024.

How much traffic does US 63 over Walnut Creek carry?

About 1,820 vehicles per day (2022 count), of which roughly 24% are trucks.

How long is US 63 over Walnut Creek?

The structure is 129 ft (39.3 m) long with a longest span of 57 ft (17.4 m) and a deck 47 ft wide.

Who owns US 63 over Walnut Creek?

It is owned by the State Highway Agency.