US Bridges

NB US 75 over Drainage Ditch

Fair

Plymouth County, Iowa · 3.0 Mi. N of Jct. SR C60 · Structure no. 000000000039481

Built
1972
53 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
34 ft
2 main spans
Daily traffic
7,000
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 75 over Drainage Ditch is a concrete continuous culvert carrying NB US 75 over Drainage Ditch in Plymouth 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 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 7,000 vehicles a day, roughly 19% of them trucks, projected to reach 7,000 by 2043. The structure is 34 ft (10.4 m) long.

Location

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CarriesNB US 75
CrossesDrainage Ditch
Location3.0 Mi. N of Jct. SR C60
RouteU.S. Route 75
CountyPlymouth County
StateIowa
Coordinates42.6678, -96.27537
Functional classRural Principal Arterial - Other

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 inspectionJuly 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.8 US tons
Inventory rating23.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length34 ft (10.4 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,000 (2022)
Projected traffic7,000 by 2043
Trucks19%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 NB US 75 over Drainage Ditch built?

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

What condition is NB US 75 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 July 2023.

How much traffic does NB US 75 over Drainage Ditch carry?

About 7,000 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is NB US 75 over Drainage Ditch?

The structure is 34 ft (10.4 m) long with a longest span of 16 ft (4.9 m).

Who owns NB US 75 over Drainage Ditch?

It is owned by the State Highway Agency.