US Bridges

Thrush over Drainage Ditch

Fair

Worth County, Iowa · 100192902 · Structure no. 000000000356371

Built
1971
54 years old
Condition
Fair
inspected November 2023
Type
Channel Beam
Concrete
Length
25 ft
1 main span
Daily traffic
393
2022 count
Owner
County
County Highway Agency

About this bridge

Thrush over Drainage Ditch is a concrete channel beam carrying Thrush over Drainage Ditch in Worth County, Iowa. It was built in 1971, so it is 54 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 5 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 393 vehicles a day, roughly 20% of them trucks, projected to reach 393 by 2043. The structure is 25 ft (7.6 m) long and 32 ft wide.

Location

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CarriesThrush
CrossesDrainage Ditch
Location100192902
RouteCounty Highway 0
CountyWorth County
StateIowa
Coordinates43.45815, -93.12437
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, 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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating36.6 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic393 (2022)
Projected traffic393 by 2043
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Thrush over Drainage Ditch built?

It was built in 1971, making it 54 years old in 2025.

What condition is Thrush 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 November 2023.

How much traffic does Thrush over Drainage Ditch carry?

About 393 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is Thrush over Drainage Ditch?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m) and a deck 32 ft wide.

Who owns Thrush over Drainage Ditch?

It is owned by the County Highway Agency.