US Bridges

400th over Drainage Ditch

Good

Worth County, Iowa · 098220401 · Structure no. 000000000355910

Built
1915
110 years old, rebuilt 2011
Condition
Good
inspected December 2023
Type
Culvert
Steel
Length
32 ft
2 main spans
Daily traffic
26
2022 count
Owner
County
County Highway Agency

About this bridge

400th over Drainage Ditch is a steel culvert carrying 400th over Drainage Ditch in Worth County, Iowa. It was built in 1915 and reconstructed in 2011, so it is 110 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 26 vehicles a day, projected to reach 26 by 2043. The structure is 32 ft (9.8 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries400th
CrossesDrainage Ditch
Location098220401
RouteCounty Highway 0
CountyWorth County
StateIowa
Coordinates43.34289, -93.44212
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38.3 US tons
Inventory rating29.3 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span30 ft (9.1 m)
Deck width24 ft (7.4 m)
Roadway width21 ft (6.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26 (2022)
Projected traffic26 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 statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 400th over Drainage Ditch built?

It was built in 1915, making it 110 years old in 2025. It was reconstructed in 2011.

What condition is 400th over Drainage Ditch 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 December 2023.

How much traffic does 400th over Drainage Ditch carry?

About 26 vehicles per day (2022 count).

How long is 400th over Drainage Ditch?

The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 24 ft wide.

Who owns 400th over Drainage Ditch?

It is owned by the County Highway Agency.