US Bridges

Ia 136 over Maquoketa River

Fair

Jones County, Iowa · 2.6 Mi. N of Jct. SR E17 · Structure no. 000000000032550

Built
1968
57 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
458 ft
5 main spans
Daily traffic
770
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 136 over Maquoketa River is a steel continuous stringer/multi-beam or girder carrying Ia 136 over Maquoketa River in Jones County, Iowa. It was built in 1968, so it is 57 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 770 vehicles a day, roughly 19% of them trucks, projected to reach 770 by 2043. The structure is 458 ft (139.6 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesIa 136
CrossesMaquoketa River
Location2.6 Mi. N of Jct. SR E17
RouteState Highway 136
CountyJones County
StateIowa
Coordinates42.20275, -91.00531
Functional classRural Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating58.3 US tons
Inventory rating34.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length458 ft (139.6 m)
Longest span99 ft (30.2 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic770 (2022)
Projected traffic770 by 2043
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Ia 136 over Maquoketa River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Ia 136 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 July 2023.

How much traffic does Ia 136 over Maquoketa River carry?

About 770 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is Ia 136 over Maquoketa River?

The structure is 458 ft (139.6 m) long with a longest span of 99 ft (30.2 m) and a deck 36 ft wide.

Who owns Ia 136 over Maquoketa River?

It is owned by the State Highway Agency.