US Bridges

FM over So Fk Maquoketa River

Good

Jackson County, Iowa · 084E21318 · Structure no. 000000000364145

Built
1999
26 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
324 ft
4 main spans
Daily traffic
1,730
2021 count
Owner
County
County Highway Agency

About this bridge

FM over So Fk Maquoketa River is a prestressed concrete stringer/multi-beam or girder carrying FM over So Fk Maquoketa River in Jackson County, Iowa. It was built in 1999, so it is 26 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,730 vehicles a day, projected to reach 1,730 by 2043. The structure is 324 ft (98.8 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesFM
CrossesSo Fk Maquoketa River
Location084E21318
RouteCounty Highway 0
StateIowa
Coordinates42.07711, -90.66605
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating57.9 US tons
Inventory rating31.1 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length324 ft (98.8 m)
Longest span81 ft (24.7 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,730 (2021)
Projected traffic1,730 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM over So Fk Maquoketa River built?

It was built in 1999, making it 26 years old in 2025.

What condition is FM over So Fk Maquoketa River in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does FM over So Fk Maquoketa River carry?

About 1,730 vehicles per day (2021 count).

How long is FM over So Fk Maquoketa River?

The structure is 324 ft (98.8 m) long with a longest span of 81 ft (24.7 m) and a deck 35 ft wide.

Who owns FM over So Fk Maquoketa River?

It is owned by the County Highway Agency.