US Bridges

I-74 (eb) over Duck Creek and Bike Path

Fair

Scott County, Iowa · 3.1 Mi. E of JCT I-80 · Structure no. 000000000047340

Built
1971
54 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
320 ft
4 main spans
Daily traffic
28,450
2022 count
Owner
State
State Highway Agency

About this bridge

I-74 (eb) over Duck Creek and Bike Path is a steel continuous stringer/multi-beam or girder carrying I-74 (eb) over Duck Creek and Bike Path in Scott 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 28,450 vehicles a day, roughly 5% of them trucks, projected to reach 28,450 by 2044. The structure is 320 ft (97.5 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-74 (eb)
CrossesDuck Creek and Bike Path
Location3.1 Mi. E of JCT I-80
RouteInterstate 74
CountyScott County
StateIowa
Coordinates41.54596, -90.51934
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating57.1 US tons
Inventory rating33.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length320 ft (97.5 m)
Longest span104 ft (31.7 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic28,450 (2022)
Projected traffic28,450 by 2044
Trucks5%
Lanes on structure2
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 I-74 (eb) over Duck Creek and Bike Path built?

It was built in 1971, making it 54 years old in 2025.

What condition is I-74 (eb) over Duck Creek and Bike Path 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 I-74 (eb) over Duck Creek and Bike Path carry?

About 28,450 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is I-74 (eb) over Duck Creek and Bike Path?

The structure is 320 ft (97.5 m) long with a longest span of 104 ft (31.7 m) and a deck 44 ft wide.

Who owns I-74 (eb) over Duck Creek and Bike Path?

It is owned by the State Highway Agency.