US Bridges

NB US 61 & 151 over Ia 946 & City Sts& Ccp R

Fair

Dubuque County, Iowa · 0.3 Mi. S of Jct. U.S. 20 · Structure no. 000000000606105

Built
1990
35 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,435 ft
10 main spans
Daily traffic
6,100
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 61 & 151 over Ia 946 & City Sts& Ccp R is a prestressed concrete stringer/multi-beam or girder carrying NB US 61 & 151 over Ia 946 & City Sts& Ccp R in Dubuque County, Iowa. It was built in 1990, so it is 35 years old, younger 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 6,100 vehicles a day, roughly 18% of them trucks, projected to reach 6,100 by 2043. The structure is 1,435 ft (437.4 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesNB US 61 & 151
CrossesIa 946 & City Sts& Ccp R
Location0.3 Mi. S of Jct. U.S. 20
RouteU.S. Route 61
CountyDubuque County
StateIowa
Coordinates42.48439, -90.66381
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81.9 US tons
Inventory rating46.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans10 (+4 approach)
Design loadHS 20
Structure length1,435 ft (437.4 m)
Longest span190 ft (57.9 m)
Deck width40 ft (12.2 m)
Roadway width39 ft (11.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,100 (2022)
Projected traffic6,100 by 2043
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was NB US 61 & 151 over Ia 946 & City Sts& Ccp R built?

It was built in 1990, making it 35 years old in 2025.

What condition is NB US 61 & 151 over Ia 946 & City Sts& Ccp R 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 November 2023.

How much traffic does NB US 61 & 151 over Ia 946 & City Sts& Ccp R carry?

About 6,100 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is NB US 61 & 151 over Ia 946 & City Sts& Ccp R?

The structure is 1,435 ft (437.4 m) long with a longest span of 190 ft (57.9 m) and a deck 40 ft wide.

Who owns NB US 61 & 151 over Ia 946 & City Sts& Ccp R?

It is owned by the State Highway Agency.