US Bridges

30th Ave over S Fork Maquoketa River

Good

Jackson County, Iowa · 085E13304 · Structure no. 000000000193241

Built
2014
11 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
292 ft
3 main spans
Daily traffic
45
2021 count
Owner
County
County Highway Agency

About this bridge

30th Ave over S Fork Maquoketa River is a prestressed concrete stringer/multi-beam or girder carrying 30th Ave over S Fork Maquoketa River in Jackson County, Iowa. It was built in 2014, so it is 11 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 45 vehicles a day, projected to reach 45 by 2043. The structure is 292 ft (89 m) long and 33 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

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Carries30th Ave
CrossesS Fork Maquoketa River
Location085E13304
RouteCounty Highway 0
CountyJackson County
StateIowa
Coordinates42.12441, -90.85834
Functional classRural Minor Collector

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length292 ft (89 m)
Longest span97 ft (29.6 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2021)
Projected traffic45 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 30th Ave over S Fork Maquoketa River built?

It was built in 2014, making it 11 years old in 2025.

What condition is 30th Ave over S Fork 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 30th Ave over S Fork Maquoketa River carry?

About 45 vehicles per day (2021 count).

How long is 30th Ave over S Fork Maquoketa River?

The structure is 292 ft (89 m) long with a longest span of 97 ft (29.6 m) and a deck 33 ft wide.

Who owns 30th Ave over S Fork Maquoketa River?

It is owned by the County Highway Agency.