US Bridges

1st Ave over N Fork Maquoketa River

Fair

Dubuque County, Iowa · 1st Ave - N Fork · Structure no. 000000000004320

Built
1915
110 years old
Condition
Fair
inspected October 2024
Type
Arch - Deck
Concrete
Length
153 ft
2 main spans
Daily traffic
2,428
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

1st Ave over N Fork Maquoketa River is a concrete arch - deck carrying 1st Ave over N Fork Maquoketa River in Dubuque County, Iowa. It was built in 1915, so it is 110 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 2,428 vehicles a day, roughly 2% of them trucks, projected to reach 2,428 by 2044. The structure is 153 ft (46.6 m) long and 55 ft wide.

Location

Open in Google Maps
Carries1st Ave
CrossesN Fork Maquoketa River
Location1st Ave - N Fork
RouteCity Street 0
CountyDubuque County
StateIowa
Coordinates42.48459, -91.1242
Functional classRural Major 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating25.6 US tons
Inventory rating18.7 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length153 ft (46.6 m)
Longest span76 ft (23.2 m)
Deck width55 ft (16.9 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,428 (2022)
Projected traffic2,428 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$200,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 1st Ave over N Fork Maquoketa River built?

It was built in 1915, making it 110 years old in 2025.

What condition is 1st Ave over N Fork Maquoketa 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 2024.

How much traffic does 1st Ave over N Fork Maquoketa River carry?

About 2,428 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 1st Ave over N Fork Maquoketa River?

The structure is 153 ft (46.6 m) long with a longest span of 76 ft (23.2 m) and a deck 55 ft wide.

Who owns 1st Ave over N Fork Maquoketa River?

It is owned by the City or Municipal Highway Agency.