US Bridges

FM over Maquoketa River

Fair

Jackson County, Iowa · 084E41306 · Structure no. 000000000192480

Built
1964
61 years old
Condition
Fair
inspected March 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
570 ft
5 main spans
Daily traffic
430
2021 count
Owner
County
County Highway Agency

About this bridge

FM over Maquoketa River is a steel continuous girder and floorbeam system carrying FM over Maquoketa River in Jackson County, Iowa. It was built in 1964, so it is 61 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 430 vehicles a day, projected to reach 430 by 2043. The structure is 570 ft (173.7 m) long and 29 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesFM
CrossesMaquoketa River
Location084E41306
RouteCounty Highway 0
CountyJackson County
StateIowa
Coordinates42.08066, -90.43527
Functional classRural Minor 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.1 US tons
Inventory rating26.8 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadH 20
Structure length570 ft (173.7 m)
Longest span125 ft (38.1 m)
Deck width29 ft (8.9 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic430 (2021)
Projected traffic430 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.8 mi (27 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over Maquoketa River built?

It was built in 1964, making it 61 years old in 2025.

What condition is FM 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 March 2023.

How much traffic does FM over Maquoketa River carry?

About 430 vehicles per day (2021 count).

How long is FM over Maquoketa River?

The structure is 570 ft (173.7 m) long with a longest span of 125 ft (38.1 m) and a deck 29 ft wide.

Who owns FM over Maquoketa River?

It is owned by the County Highway Agency.