US 20 over Drainage Ditch No 1 & 54

Good

Calhoun County, Iowa · 2.4 Mi. E of Jct. SR N28 · Structure no. 000000000609755

Built: 2010; 15 years old
Condition: Good; inspected January 2023
Type: Culvert; Concrete Continuous
Length: 35 ft; 2 main spans
Daily traffic: 5,900; 2022 count
Owner: State; State Highway Agency

About this bridge

US 20 over Drainage Ditch No 1 & 54 is a concrete continuous culvert carrying US 20 over Drainage Ditch No 1 & 54 in Calhoun County, Iowa. It was built in 2010, so it is 15 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,900 vehicles a day, roughly 35% of them trucks, projected to reach 5,900 by 2042. The structure is 35 ft (10.7 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesUS 20

CrossesDrainage Ditch No 1 & 54

Location2.4 Mi. E of Jct. SR N28

RouteU.S. Route 20

CountyCalhoun County

StateIowa

Coordinates42.44936, -94.80906

Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

Component	Rating	Meaning
Channel and channel protection	8 Very Good	No problems noted.
Culvert	7 Good	Some minor problems.

Last inspectionJanuary 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation7: Better than present minimum criteria

Waterway adequacy9: Superior to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating53.5 US tons

Inventory rating32.1 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckNot applicable

Main spans2

Design loadHS 20

Structure length35 ft (10.7 m)

Longest span17 ft (5.2 m)

Deck width0 ft (0 m)

Roadway width0 ft (0 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,900 (2022)

Projected traffic5,900 by 2042

Trucks35%

Lanes on structure4

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—

NavigationNot applicable (no waterway)

Frequently asked questions

When was US 20 over Drainage Ditch No 1 & 54 built?

It was built in 2010, making it 15 years old in 2025.

What condition is US 20 over Drainage Ditch No 1 & 54 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2023.

How much traffic does US 20 over Drainage Ditch No 1 & 54 carry?

About 5,900 vehicles per day (2022 count), of which roughly 35% are trucks.

How long is US 20 over Drainage Ditch No 1 & 54?

The structure is 35 ft (10.7 m) long with a longest span of 17 ft (5.2 m).

Who owns US 20 over Drainage Ditch No 1 & 54?

It is owned by the State Highway Agency.