US Bridges

North Main ST over Maquoketa River

Fair

Jones County, Iowa · 086032209 · Structure no. 000000000032270

Built
1969
56 years old
Condition
Fair
inspected November 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
353 ft
3 main spans
Daily traffic
2,787
2022 count
Owner
County
County Highway Agency

About this bridge

North Main ST over Maquoketa River is a steel continuous girder and floorbeam system carrying North Main ST over Maquoketa River in Jones County, Iowa. It was built in 1969, so it is 56 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 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 2,787 vehicles a day, roughly 10% of them trucks, projected to reach 2,787 by 2043. The structure is 353 ft (107.6 m) long and 48 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNorth Main ST
CrossesMaquoketa River
Location086032209
RouteCity Street 0
CountyJones County
StateIowa
Coordinates42.24349, -91.18014
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating60.5 US tons
Inventory rating36.4 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length353 ft (107.6 m)
Longest span137 ft (41.8 m)
Deck width48 ft (14.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,787 (2022)
Projected traffic2,787 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 North Main ST over Maquoketa River built?

It was built in 1969, making it 56 years old in 2025.

What condition is North Main ST over 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 November 2023.

How much traffic does North Main ST over Maquoketa River carry?

About 2,787 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is North Main ST over Maquoketa River?

The structure is 353 ft (107.6 m) long with a longest span of 137 ft (41.8 m) and a deck 48 ft wide.

Who owns North Main ST over Maquoketa River?

It is owned by the County Highway Agency.