US Bridges

Thrush over Drainage Ditch

Fair

Worth County, Iowa · 100192902 · Structure no. 000000000356361

Built
1971
54 years old
Condition
Fair
inspected November 2023
Type
Slab
Concrete Continuous
Length
78 ft
3 main spans
Daily traffic
393
2022 count
Owner
County
County Highway Agency

About this bridge

Thrush over Drainage Ditch is a concrete continuous slab 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 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 393 vehicles a day, roughly 20% of them trucks, projected to reach 393 by 2043. The structure is 78 ft (23.8 m) long and 32 ft wide.

CarriesThrush
CrossesDrainage Ditch
Location100192902
RouteCounty Highway 0
StateIowa
Coordinates43.4461, -93.12441
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating75.7 US tons
Inventory rating46 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length78 ft (23.8 m)
Longest span29 ft (8.8 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$356,000
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 78 ft (23.8 m) long with a longest span of 29 ft (8.8 m) and a deck 32 ft wide.

Who owns Thrush over Drainage Ditch?

It is owned by the County Highway Agency.