US Bridges

US 52 over US 20

Good

Dubuque County, Iowa · Ia 32 over US20 in Dubuqu · Structure no. 000000000700835

Built
2019
6 years old
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
659 ft
5 main spans
Daily traffic
6,000
2022 count
Owner
State
State Highway Agency

About this bridge

US 52 over US 20 is a prestressed concrete stringer/multi-beam or girder carrying US 52 over US 20 in Dubuque County, Iowa. It was built in 2019, so it is 6 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,000 vehicles a day, roughly 15% of them trucks, projected to reach 6,000 by 2044. The structure is 659 ft (200.9 m) long and 94 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 52
CrossesUS 20
LocationIa 32 over US20 in Dubuqu
RouteU.S. Route 52
CountyDubuque County
StateIowa
Coordinates42.47458, -90.76048
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 23 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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHL 93
Structure length659 ft (200.9 m)
Longest span157 ft (47.9 m)
Deck width94 ft (28.7 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2022)
Projected traffic6,000 by 2044
Trucks15%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 52 over US 20 built?

It was built in 2019, making it 6 years old in 2025.

What condition is US 52 over US 20 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 2024.

How much traffic does US 52 over US 20 carry?

About 6,000 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is US 52 over US 20?

The structure is 659 ft (200.9 m) long with a longest span of 157 ft (47.9 m) and a deck 94 ft wide.

Who owns US 52 over US 20?

It is owned by the State Highway Agency.