US Bridges

56th ST over Spencer Creek Trib

FairPosted for load

Scott County, Iowa · Bettendorf Ia · Structure no. 000000000000694

Built
1926
99 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
27 ft
2 main spans
Daily traffic
105
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

56th ST over Spencer Creek Trib is a concrete continuous culvert carrying 56th ST over Spencer Creek Trib in Scott County, Iowa. It was built in 1926, so it is 99 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. Its operating status is: posted for load restriction.

It carries about 105 vehicles a day, projected to reach 105 by 2043. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries56th ST
CrossesSpencer Creek Trib
LocationBettendorf Ia
RouteCity Street 0
CountyScott County
StateIowa
Coordinates41.60791, -90.45202
Functional classUrban Local

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.5 US tons
Inventory rating17.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span13 ft (4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic105 (2022)
Projected traffic105 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was 56th ST over Spencer Creek Trib built?

It was built in 1926, making it 99 years old in 2025.

What condition is 56th ST over Spencer Creek Trib 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 July 2023.

How much traffic does 56th ST over Spencer Creek Trib carry?

About 105 vehicles per day (2022 count).

How long is 56th ST over Spencer Creek Trib?

The structure is 27 ft (8.2 m) long with a longest span of 13 ft (4 m).

Who owns 56th ST over Spencer Creek Trib?

It is owned by the City or Municipal Highway Agency.