US Bridges

N Division ST over Duck Creek

Good

Scott County, Iowa · 000000000 · Structure no. 000000000003250

Built
1963
62 years old, rebuilt 1984
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
109 ft
3 main spans
Daily traffic
12,300
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

N Division ST over Duck Creek is a steel stringer/multi-beam or girder carrying N Division ST over Duck Creek in Scott County, Iowa. It was built in 1963 and reconstructed in 1984, so it is 62 years old, older than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 12,300 vehicles a day, projected to reach 12,300 by 2043. The structure is 109 ft (33.2 m) long and 60 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesN Division ST
CrossesDuck Creek
Location000000000
RouteCity Street 0
CountyScott County
StateIowa
Coordinates41.55249, -90.60079
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck9 ExcellentNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 rating43.5 US tons
Inventory rating26.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length109 ft (33.2 m)
Longest span41 ft (12.5 m)
Deck width60 ft (18.3 m)
Roadway width46 ft (14.1 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 proposedDeck replacement with only incidental widening
Estimated improvement cost$620,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N Division ST over Duck Creek built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1984.

What condition is N Division ST over Duck Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.

How much traffic does N Division ST over Duck Creek carry?

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

How long is N Division ST over Duck Creek?

The structure is 109 ft (33.2 m) long with a longest span of 41 ft (12.5 m) and a deck 60 ft wide.

Who owns N Division ST over Duck Creek?

It is owned by the City or Municipal Highway Agency.