US Bridges

Ia 175 over Drainage Ditch

Fair

Monona County, Iowa · 3.0 Mi. E of S.R. L12 · Structure no. 000000000036860

Built
1964
61 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
214 ft
3 main spans
Daily traffic
2,160
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 175 over Drainage Ditch is a steel continuous stringer/multi-beam or girder carrying Ia 175 over Drainage Ditch in Monona County, Iowa. It was built in 1964, so it is 61 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 2,160 vehicles a day, roughly 14% of them trucks, projected to reach 2,160 by 2044. The structure is 214 ft (65.2 m) long and 36 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesIa 175
CrossesDrainage Ditch
Location3.0 Mi. E of S.R. L12
RouteState Highway 175
CountyMonona County
StateIowa
Coordinates42.03005, -96.02103
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.1 US tons
Inventory rating28.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length214 ft (65.2 m)
Longest span92 ft (28 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,160 (2022)
Projected traffic2,160 by 2044
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Ia 175 over Drainage Ditch built?

It was built in 1964, making it 61 years old in 2025.

What condition is Ia 175 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 June 2024.

How much traffic does Ia 175 over Drainage Ditch carry?

About 2,160 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is Ia 175 over Drainage Ditch?

The structure is 214 ft (65.2 m) long with a longest span of 92 ft (28 m) and a deck 36 ft wide.

Who owns Ia 175 over Drainage Ditch?

It is owned by the State Highway Agency.