US Bridges

Marquette ST over Duck Creek

Fair

Scott County, Iowa · 000000000 · Structure no. 000000000003290

Built
1965
60 years old, rebuilt 1986
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
252 ft
4 main spans
Daily traffic
12,300
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Marquette ST over Duck Creek is a prestressed concrete stringer/multi-beam or girder carrying Marquette ST over Duck Creek in Scott County, Iowa. It was built in 1965 and reconstructed in 1986, so it is 60 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 12,300 vehicles a day, projected to reach 12,300 by 2043. The structure is 252 ft (76.8 m) long and 60 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMarquette ST
CrossesDuck Creek
Location000000000
RouteCity Street 0
CountyScott County
StateIowa
Coordinates41.55189, -90.59111
Functional classUrban Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length252 ft (76.8 m)
Longest span68 ft (20.7 m)
Deck width60 ft (18.3 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,300 (2022)
Projected traffic12,300 by 2043
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$120,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Marquette ST over Duck Creek built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1986.

What condition is Marquette ST over Duck Creek 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 2023.

How much traffic does Marquette ST over Duck Creek carry?

About 12,300 vehicles per day (2022 count).

How long is Marquette ST over Duck Creek?

The structure is 252 ft (76.8 m) long with a longest span of 68 ft (20.7 m) and a deck 60 ft wide.

Who owns Marquette ST over Duck Creek?

It is owned by the City or Municipal Highway Agency.