US Bridges

J23 170th ST over Drainage Ditch

Fair

Taylor County, Iowa · 069331101 · Structure no. 000000000049910

Built
1935
90 years old, rebuilt 1958
Condition
Fair
inspected May 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
309
2021 count
Owner
County
County Highway Agency

About this bridge

J23 170th ST over Drainage Ditch is a concrete continuous culvert carrying J23 170th ST over Drainage Ditch in Taylor County, Iowa. It was built in 1935 and reconstructed in 1958, so it is 90 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 309 vehicles a day, roughly 17% of them trucks, projected to reach 309 by 2043. The structure is 21 ft (6.4 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesJ23 170th ST
CrossesDrainage Ditch
Location069331101
RouteCounty Highway 0
CountyTaylor County
StateIowa
Coordinates40.79924, -94.61325
Functional classRural Minor 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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.9 US tons
Inventory rating51.5 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width34 ft (10.4 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic309 (2021)
Projected traffic309 by 2043
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was J23 170th ST over Drainage Ditch built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 1958.

What condition is J23 170th ST 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 May 2023.

How much traffic does J23 170th ST over Drainage Ditch carry?

About 309 vehicles per day (2021 count), of which roughly 17% are trucks.

How long is J23 170th ST over Drainage Ditch?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 34 ft wide.

Who owns J23 170th ST over Drainage Ditch?

It is owned by the County Highway Agency.