US Bridges

Ia 70 over Drainage Ditch

Fair

Muscatine County, Iowa · 0.4 Mi. S of JCT Iowa 22 · Structure no. 000000000038171

Built
1988
37 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
134 ft
3 main spans
Daily traffic
830
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 70 over Drainage Ditch is a prestressed concrete stringer/multi-beam or girder carrying Ia 70 over Drainage Ditch in Muscatine County, Iowa. It was built in 1988, so it is 37 years old, younger 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 830 vehicles a day, roughly 17% of them trucks, projected to reach 830 by 2044. The structure is 134 ft (40.8 m) long and 39 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

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CarriesIa 70
CrossesDrainage Ditch
Location0.4 Mi. S of JCT Iowa 22
RouteState Highway 70
CountyMuscatine County
StateIowa
Coordinates41.47516, -91.30943
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating85.4 US tons
Inventory rating50.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length134 ft (40.8 m)
Longest span44 ft (13.4 m)
Deck width39 ft (11.9 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic830 (2022)
Projected traffic830 by 2044
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 70 over Drainage Ditch built?

It was built in 1988, making it 37 years old in 2025.

What condition is Ia 70 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 70 over Drainage Ditch carry?

About 830 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is Ia 70 over Drainage Ditch?

The structure is 134 ft (40.8 m) long with a longest span of 44 ft (13.4 m) and a deck 39 ft wide.

Who owns Ia 70 over Drainage Ditch?

It is owned by the State Highway Agency.