US Bridges

FM over Maquoketa River

FairPosted for load

Jackson County, Iowa · 084E50404 · Structure no. 000000000192570

Built
1956
69 years old
Condition
Fair
inspected March 2023
Type
Truss - Thru
Steel
Length
571 ft
1 main span
Daily traffic
610
2021 count
Owner
County
County Highway Agency

About this bridge

FM over Maquoketa River is a steel truss - thru carrying FM over Maquoketa River in Jackson County, Iowa. It was built in 1956, so it is 69 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. Its operating status is: posted for load restriction.

It carries about 610 vehicles a day, roughly 12% of them trucks, projected to reach 610 by 2043. The structure is 571 ft (174 m) long and 22 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesFM
CrossesMaquoketa River
Location084E50404
RouteCounty Highway 0
CountyJackson County
StateIowa
Coordinates42.1183, -90.39352
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating19 US tons
Inventory rating14.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+4 approach)
Design loadH 15
Structure length571 ft (174 m)
Longest span250 ft (76.2 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck14 ft (4.3 m)

Traffic and service

Average daily traffic610 (2021)
Projected traffic610 by 2043
Trucks12%
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 1956, making it 69 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 610 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is FM over Maquoketa River?

The structure is 571 ft (174 m) long with a longest span of 250 ft (76.2 m) and a deck 22 ft wide.

Who owns FM over Maquoketa River?

It is owned by the County Highway Agency.