US Bridges

400th ST over Drainage

Good

Pottawattamie County, Iowa · 075403404 · Structure no. 000000000285976

Built
2008
17 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
29
2022 count
Owner
County
County Highway Agency

About this bridge

400th ST over Drainage is a concrete continuous culvert carrying 400th ST over Drainage in Pottawattamie County, Iowa. It was built in 2008, so it is 17 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 29 vehicles a day, projected to reach 29 by 2043. The structure is 28 ft (8.5 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries400th ST
CrossesDrainage
Location075403404
RouteCounty Highway 0
CountyPottawattamie County
StateIowa
Coordinates41.25106, -95.42752
Functional classRural Minor Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionJuly 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span14 ft (4.3 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29 (2022)
Projected traffic29 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 400th ST over Drainage built?

It was built in 2008, making it 17 years old in 2025.

What condition is 400th ST over Drainage 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 July 2023.

How much traffic does 400th ST over Drainage carry?

About 29 vehicles per day (2022 count).

How long is 400th ST over Drainage?

The structure is 28 ft (8.5 m) long with a longest span of 14 ft (4.3 m) and a deck 28 ft wide.

Who owns 400th ST over Drainage?

It is owned by the County Highway Agency.