US Bridges

SB NW Arterial over Over Cc RR & Catfish Ck

Good

Dubuque County, Iowa · 0.2 Mi. N of Jct. US 20 · Structure no. 000000000601940

Built
1997
28 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
299 ft
4 main spans
Daily traffic
4,696
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

SB NW Arterial over Over Cc RR & Catfish Ck is a prestressed concrete stringer/multi-beam or girder carrying SB NW Arterial over Over Cc RR & Catfish Ck in Dubuque County, Iowa. It was built in 1997, so it is 28 years old, younger 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 4,696 vehicles a day, roughly 7% of them trucks, projected to reach 4,696 by 2043. The structure is 299 ft (91.1 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesSB NW Arterial
CrossesOver Cc RR & Catfish Ck
Location0.2 Mi. N of Jct. US 20
RouteCity Street 0
StateIowa
Coordinates42.49224, -90.74034
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating39.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length299 ft (91.1 m)
Longest span82 ft (25 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,696 (2022)
Projected traffic4,696 by 2043
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SB NW Arterial over Over Cc RR & Catfish Ck built?

It was built in 1997, making it 28 years old in 2025.

What condition is SB NW Arterial over Over Cc RR & Catfish Ck 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 August 2023.

How much traffic does SB NW Arterial over Over Cc RR & Catfish Ck carry?

About 4,696 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SB NW Arterial over Over Cc RR & Catfish Ck?

The structure is 299 ft (91.1 m) long with a longest span of 82 ft (25 m) and a deck 43 ft wide.

Who owns SB NW Arterial over Over Cc RR & Catfish Ck?

It is owned by the City or Municipal Highway Agency.