US Bridges

US 6 over Walnut Creek

Good

Pottawattamie County, Iowa · 0.1 Mi. E of SR M-47 · Structure no. 000000000043331

Built
1985
40 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
159 ft
3 main spans
Daily traffic
1,090
2022 count
Owner
State
State Highway Agency

About this bridge

US 6 over Walnut Creek is a prestressed concrete stringer/multi-beam or girder carrying US 6 over Walnut Creek in Pottawattamie County, Iowa. It was built in 1985, so it is 40 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 1,090 vehicles a day, roughly 16% of them trucks, projected to reach 1,090 by 2042. The structure is 159 ft (48.5 m) long and 43 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesUS 6
CrossesWalnut Creek
Location0.1 Mi. E of SR M-47
RouteU.S. Route 6
StateIowa
Coordinates41.31781, -95.21374
Functional classRural Minor Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.3 US tons
Inventory rating53.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length159 ft (48.5 m)
Longest span73 ft (22.3 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,090 (2022)
Projected traffic1,090 by 2042
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

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 6 over Walnut Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is US 6 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 August 2023.

How much traffic does US 6 over Walnut Creek carry?

About 1,090 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is US 6 over Walnut Creek?

The structure is 159 ft (48.5 m) long with a longest span of 73 ft (22.3 m) and a deck 43 ft wide.

Who owns US 6 over Walnut Creek?

It is owned by the State Highway Agency.