US Bridges

NB US 61 over 11th ST

Fair

Dubuque County, Iowa · 1.0 Mi. N of Jct. US 20 · Structure no. 000000000601140

Built
1992
33 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
205 ft
3 main spans
Daily traffic
11,150
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 61 over 11th ST is a prestressed concrete stringer/multi-beam or girder carrying NB US 61 over 11th ST in Dubuque County, Iowa. It was built in 1992, so it is 33 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 11,150 vehicles a day, roughly 17% of them trucks, projected to reach 11,150 by 2042. The structure is 205 ft (62.5 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
Crosses11th ST
Location1.0 Mi. N of Jct. US 20
RouteU.S. Route 61
CountyDubuque County
StateIowa
Coordinates42.50533, -90.66019
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.6 US tons
Inventory rating31.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length205 ft (62.5 m)
Longest span77 ft (23.5 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,150 (2022)
Projected traffic11,150 by 2042
Trucks17%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 over 11th ST built?

It was built in 1992, making it 33 years old in 2025.

What condition is NB US 61 over 11th ST 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 NB US 61 over 11th ST carry?

About 11,150 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is NB US 61 over 11th ST?

The structure is 205 ft (62.5 m) long with a longest span of 77 ft (23.5 m) and a deck 40 ft wide.

Who owns NB US 61 over 11th ST?

It is owned by the State Highway Agency.