US Bridges

US 30 & 151 over Drainage Ditch

Fair

Linn County, Iowa · 0.3 Mi. E of Jct. I-380 · Structure no. 000000000607120

Built
1975
50 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete Continuous
Length
33 ft
2 main spans
Daily traffic
22,500
2022 count
Owner
State
State Highway Agency

About this bridge

US 30 & 151 over Drainage Ditch is a concrete continuous culvert carrying US 30 & 151 over Drainage Ditch in Linn County, Iowa. It was built in 1975, so it is 50 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 22,500 vehicles a day, roughly 13% of them trucks, projected to reach 22,500 by 2042. The structure is 33 ft (10.1 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesUS 30 & 151
CrossesDrainage Ditch
Location0.3 Mi. E of Jct. I-380
RouteU.S. Route 30
CountyLinn County
StateIowa
Coordinates41.92679, -91.66416
Functional classUrban Other Principal Arterial

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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 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 alignment7: Better than present minimum criteria
Operating rating42.2 US tons
Inventory rating25.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length33 ft (10.1 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic22,500 (2022)
Projected traffic22,500 by 2042
Trucks13%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 & 151 over Drainage Ditch built?

It was built in 1975, making it 50 years old in 2025.

What condition is US 30 & 151 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 June 2023.

How much traffic does US 30 & 151 over Drainage Ditch carry?

About 22,500 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is US 30 & 151 over Drainage Ditch?

The structure is 33 ft (10.1 m) long with a longest span of 15 ft (4.6 m).

Who owns US 30 & 151 over Drainage Ditch?

It is owned by the State Highway Agency.