US Bridges

Ia 92 over Walnut Creek

Fair

Pottawattamie County, Iowa · 0.9 Mi. E of SR M-47 · Structure no. 000000000043920

Built
1938
87 years old, rebuilt 1967
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
152 ft
3 main spans
Daily traffic
1,180
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 92 over Walnut Creek is a steel continuous stringer/multi-beam or girder carrying Ia 92 over Walnut Creek in Pottawattamie County, Iowa. It was built in 1938 and reconstructed in 1967, so it is 87 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,180 vehicles a day, roughly 19% of them trucks, projected to reach 1,180 by 2043. The structure is 152 ft (46.3 m) long and 35 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIa 92
CrossesWalnut Creek
Location0.9 Mi. E of SR M-47
RouteState Highway 92
CountyPottawattamie County
StateIowa
Coordinates41.23179, -95.21528
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.2 US tons
Inventory rating23.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length152 ft (46.3 m)
Longest span59 ft (18 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,180 (2022)
Projected traffic1,180 by 2043
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 Ia 92 over Walnut Creek built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1967.

What condition is Ia 92 over Walnut Creek in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.

How much traffic does Ia 92 over Walnut Creek carry?

About 1,180 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is Ia 92 over Walnut Creek?

The structure is 152 ft (46.3 m) long with a longest span of 59 ft (18 m) and a deck 35 ft wide.

Who owns Ia 92 over Walnut Creek?

It is owned by the State Highway Agency.