US Bridges

400 Avenue over Walnut Creek

Good

Fremont County, Iowa · 070402602 · Structure no. 000000000160831

Built
1987
38 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
218 ft
3 main spans
Daily traffic
11
2022 count
Owner
County
County Highway Agency

About this bridge

400 Avenue over Walnut Creek is a prestressed concrete stringer/multi-beam or girder carrying 400 Avenue over Walnut Creek in Fremont County, Iowa. It was built in 1987, so it is 38 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 11 vehicles a day, projected to reach 11 by 2043. The structure is 218 ft (66.4 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries400 Avenue
CrossesWalnut Creek
Location070402602
RouteCounty Highway 0
CountyFremont County
StateIowa
Coordinates40.83504, -95.42247
Functional classRural Local

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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating80.1 US tons
Inventory rating35.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length218 ft (66.4 m)
Longest span77 ft (23.5 m)
Deck width27 ft (8.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2022)
Projected traffic11 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was 400 Avenue over Walnut Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is 400 Avenue 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 April 2023.

How much traffic does 400 Avenue over Walnut Creek carry?

About 11 vehicles per day (2022 count).

How long is 400 Avenue over Walnut Creek?

The structure is 218 ft (66.4 m) long with a longest span of 77 ft (23.5 m) and a deck 27 ft wide.

Who owns 400 Avenue over Walnut Creek?

It is owned by the County Highway Agency.