US Bridges

US 30 over Drainage Ditch

Fair

Clinton County, Iowa · 1.2 Mi. E of Jct. SR Y68 · Structure no. 000000000607216

Built
1974
51 years old
Condition
Fair
inspected December 2022
Type
Culvert
Concrete Continuous
Length
22 ft
2 main spans
Daily traffic
9,400
2022 count
Owner
State
State Highway Agency

About this bridge

US 30 over Drainage Ditch is a concrete continuous culvert carrying US 30 over Drainage Ditch in Clinton County, Iowa. It was built in 1974, so it is 51 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 9,400 vehicles a day, roughly 15% of them trucks, projected to reach 9,400 by 2042. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 30
CrossesDrainage Ditch
Location1.2 Mi. E of Jct. SR Y68
RouteU.S. Route 30
CountyClinton County
StateIowa
Coordinates41.80758, -90.51503
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 inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74.1 US tons
Inventory rating44.4 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length22 ft (6.7 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 traffic9,400 (2022)
Projected traffic9,400 by 2042
Trucks15%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
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 US 30 over Drainage Ditch built?

It was built in 1974, making it 51 years old in 2025.

What condition is US 30 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 December 2022.

How much traffic does US 30 over Drainage Ditch carry?

About 9,400 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is US 30 over Drainage Ditch?

The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3 m).

Who owns US 30 over Drainage Ditch?

It is owned by the State Highway Agency.