US Bridges

I-35 over Drainage Ditch

Good

Worth County, Iowa · 3.3 Mi. N of Jct. 9 · Structure no. 000000000600160

Built
1972
53 years old
Condition
Good
inspected April 2024
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
20,600
2023 count
Owner
State
State Highway Agency

About this bridge

I-35 over Drainage Ditch is a concrete continuous culvert carrying I-35 over Drainage Ditch in Worth County, Iowa. It was built in 1972, so it is 53 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 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 20,600 vehicles a day, roughly 31% of them trucks, projected to reach 20,600 by 2043. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesI-35
CrossesDrainage Ditch
Location3.3 Mi. N of Jct. 9
RouteInterstate 35
StateIowa
Coordinates43.33586, -93.34861
Functional classRural Principal Arterial - Interstate

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 inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating15.9 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,600 (2023)
Projected traffic20,600 by 2043
Trucks31%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-35 over Drainage Ditch built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-35 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 April 2024.

How much traffic does I-35 over Drainage Ditch carry?

About 20,600 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is I-35 over Drainage Ditch?

The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m).

Who owns I-35 over Drainage Ditch?

It is owned by the State Highway Agency.