US Bridges

Dubuque ST over Boone River

Fair

Hamilton County, Iowa · 000000000 · Structure no. 000000000012270

Built
1954
71 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
344 ft
3 main spans
Daily traffic
1,695
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Dubuque ST over Boone River is a steel continuous stringer/multi-beam or girder carrying Dubuque ST over Boone River in Hamilton County, Iowa. It was built in 1954, so it is 71 years old, older 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 5 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 1,695 vehicles a day, projected to reach 1,695 by 2043. The structure is 344 ft (104.9 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesDubuque ST
CrossesBoone River
Location000000000
RouteCity Street 0
CountyHamilton County
StateIowa
Coordinates42.46604, -93.81048
Functional classUrban Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating44.3 US tons
Inventory rating26.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length344 ft (104.9 m)
Longest span133 ft (40.4 m)
Deck width38 ft (11.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,695 (2022)
Projected traffic1,695 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Dubuque ST over Boone River built?

It was built in 1954, making it 71 years old in 2025.

What condition is Dubuque ST over Boone 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 October 2023.

How much traffic does Dubuque ST over Boone River carry?

About 1,695 vehicles per day (2022 count).

How long is Dubuque ST over Boone River?

The structure is 344 ft (104.9 m) long with a longest span of 133 ft (40.4 m) and a deck 38 ft wide.

Who owns Dubuque ST over Boone River?

It is owned by the City or Municipal Highway Agency.