US Bridges

Mallard Ave over Drainage Ditch

Poor

Worth County, Iowa · 100203102 · Structure no. 000000000356470

Built
1973
52 years old, rebuilt 2013
Condition
Poor
inspected November 2023
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
216
2022 count
Owner
County
County Highway Agency

About this bridge

Mallard Ave over Drainage Ditch is a concrete channel beam carrying Mallard Ave over Drainage Ditch in Worth County, Iowa. It was built in 1973 and reconstructed in 2013, so it is 52 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 216 vehicles a day, roughly 13% of them trucks, projected to reach 216 by 2043. The structure is 31 ft (9.4 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMallard Ave
CrossesDrainage Ditch
Location100203102
RouteCounty Highway 0
CountyWorth County
StateIowa
Coordinates43.44387, -93.26091
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
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
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating52.1 US tons
Inventory rating40.3 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length31 ft (9.4 m)
Longest span30 ft (9.1 m)
Deck width31 ft (9.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic216 (2022)
Projected traffic216 by 2043
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Mallard Ave over Drainage Ditch built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2013.

What condition is Mallard Ave over Drainage Ditch in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2023.

How much traffic does Mallard Ave over Drainage Ditch carry?

About 216 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Mallard Ave over Drainage Ditch?

The structure is 31 ft (9.4 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.

Who owns Mallard Ave over Drainage Ditch?

It is owned by the County Highway Agency.