US Bridges

Swiss Valley Road over US 20

Good

Dubuque County, Iowa · 2.8 MI S of Jct. US 52 · Structure no. 000000000700465

Built
2021
4 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
224 ft
2 main spans
Daily traffic
196
2022 count
Owner
State
State Highway Agency

About this bridge

Swiss Valley Road over US 20 is a prestressed concrete stringer/multi-beam or girder carrying Swiss Valley Road over US 20 in Dubuque County, Iowa. It was built in 2021, so it is 4 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 196 vehicles a day, roughly 13% of them trucks, projected to reach 196 by 2042. The structure is 224 ft (68.4 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSwiss Valley Road
CrossesUS 20
Location2.8 MI S of Jct. US 52
RouteCounty Highway 0
CountyDubuque County
StateIowa
Coordinates42.44121, -90.78753
Functional classRural Major Collector

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.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: 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 spans2
Design loadHL 93
Structure length224 ft (68.4 m)
Longest span111 ft (33.8 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic196 (2022)
Projected traffic196 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Swiss Valley Road over US 20 built?

It was built in 2021, making it 4 years old in 2025.

What condition is Swiss Valley Road 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 October 2023.

How much traffic does Swiss Valley Road over US 20 carry?

About 196 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is Swiss Valley Road over US 20?

The structure is 224 ft (68.4 m) long with a longest span of 111 ft (33.8 m) and a deck 47 ft wide.

Who owns Swiss Valley Road over US 20?

It is owned by the State Highway Agency.