US Bridges

NB I-35 EB I-80 over Drainage Ditch

Fair

Polk County, Iowa · 0.8 Mi. W of Jct. Ia 415 · Structure no. 000000000041530

Built
1958
67 years old, rebuilt 1990
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
112 ft
3 main spans
Daily traffic
48,850
2023 count
Owner
State
State Highway Agency

About this bridge

NB I-35 EB I-80 over Drainage Ditch is a prestressed concrete stringer/multi-beam or girder carrying NB I-35 EB I-80 over Drainage Ditch in Polk County, Iowa. It was built in 1958 and reconstructed in 1990, so it is 67 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 48,850 vehicles a day, roughly 20% of them trucks, projected to reach 48,850 by 2044. The structure is 112 ft (34.1 m) long and 67 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesNB I-35 EB I-80
CrossesDrainage Ditch
Location0.8 Mi. W of Jct. Ia 415
RouteInterstate 80
CountyPolk County
StateIowa
Coordinates41.64938, -93.63486
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.7 US tons
Inventory rating35.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length112 ft (34.1 m)
Longest span40 ft (12.2 m)
Deck width67 ft (20.4 m)
Roadway width63 ft (19.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48,850 (2023)
Projected traffic48,850 by 2044
Trucks20%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 NB I-35 EB I-80 over Drainage Ditch built?

It was built in 1958, making it 67 years old in 2025. It was reconstructed in 1990.

What condition is NB I-35 EB I-80 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 September 2024.

How much traffic does NB I-35 EB I-80 over Drainage Ditch carry?

About 48,850 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is NB I-35 EB I-80 over Drainage Ditch?

The structure is 112 ft (34.1 m) long with a longest span of 40 ft (12.2 m) and a deck 67 ft wide.

Who owns NB I-35 EB I-80 over Drainage Ditch?

It is owned by the State Highway Agency.