US Bridges

Dubuque ST over Iowa River

Fair

Johnson County, Iowa · 080063318 · Structure no. 000000000204951

Built
1991
34 years old
Condition
Fair
inspected April 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
446 ft
5 main spans
Daily traffic
6,900
2022 count
Owner
County
County Highway Agency

About this bridge

Dubuque ST over Iowa River is a prestressed concrete stringer/multi-beam or girder carrying Dubuque ST over Iowa River in Johnson County, Iowa. It was built in 1991, so it is 34 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 6,900 vehicles a day, projected to reach 6,900 by 2043. The structure is 446 ft (135.9 m) long and 42 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesDubuque ST
CrossesIowa River
Location080063318
RouteCounty Highway 0
CountyJohnson County
StateIowa
Coordinates41.69331, -91.54721
Functional classUrban Minor 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating83.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHL 93
Structure length446 ft (135.9 m)
Longest span96 ft (29.3 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,900 (2022)
Projected traffic6,900 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Dubuque ST over Iowa River built?

It was built in 1991, making it 34 years old in 2025.

What condition is Dubuque ST over Iowa River 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 April 2021.

How much traffic does Dubuque ST over Iowa River carry?

About 6,900 vehicles per day (2022 count).

How long is Dubuque ST over Iowa River?

The structure is 446 ft (135.9 m) long with a longest span of 96 ft (29.3 m) and a deck 42 ft wide.

Who owns Dubuque ST over Iowa River?

It is owned by the County Highway Agency.