US Bridges

Ia 85 over Drainage Ditch

Fair

Poweshiek County, Iowa · 0.7 Miles E of SR V21 · Structure no. 000000000045960

Built
1957
68 years old
Condition
Fair
inspected May 2024
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
800
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 85 over Drainage Ditch is a concrete continuous culvert carrying Ia 85 over Drainage Ditch in Poweshiek 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 6 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 800 vehicles a day, roughly 11% of them trucks, projected to reach 800 by 2044. The structure is 32 ft (9.8 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesIa 85
CrossesDrainage Ditch
Location0.7 Miles E of SR V21
RouteState Highway 85
CountyPoweshiek County
StateIowa
Coordinates41.58642, -92.37975
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating20.3 US tons
Inventory rating15 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 15
Structure length32 ft (9.8 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 traffic800 (2022)
Projected traffic800 by 2044
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Ia 85 over Drainage Ditch built?

It was built in 1957, making it 68 years old in 2025.

What condition is Ia 85 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 May 2024.

How much traffic does Ia 85 over Drainage Ditch carry?

About 800 vehicles per day (2022 count), of which roughly 11% are trucks.

How long is Ia 85 over Drainage Ditch?

The structure is 32 ft (9.8 m) long with a longest span of 10 ft (3 m).

Who owns Ia 85 over Drainage Ditch?

It is owned by the State Highway Agency.