US Bridges

I-35 over Drainage Ditch

Fair

Clarke County, Iowa · 0.7 Mi. S. of JCT.152 · Structure no. 000000000020200

Built
1957
68 years old
Condition
Fair
inspected August 2023
Type
Culvert
Concrete Continuous
Length
35 ft
3 main spans
Daily traffic
18,600
2022 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 Clarke County, Iowa. It was built in 1957, so it is 68 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 5 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 18,600 vehicles a day, roughly 31% of them trucks, projected to reach 18,600 by 2043. The structure is 35 ft (10.7 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-35
CrossesDrainage Ditch
Location0.7 Mi. S. of JCT.152
RouteInterstate 35
CountyClarke County
StateIowa
Coordinates41.05883, -93.78157
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: 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 rating99.8 US tons
Inventory rating62.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length35 ft (10.7 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,600 (2022)
Projected traffic18,600 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 1957, making it 68 years old in 2025.

What condition is I-35 over Drainage Ditch 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 I-35 over Drainage Ditch carry?

About 18,600 vehicles per day (2022 count), of which roughly 31% are trucks.

How long is I-35 over Drainage Ditch?

The structure is 35 ft (10.7 m) long with a longest span of 10 ft (3 m).

Who owns I-35 over Drainage Ditch?

It is owned by the State Highway Agency.