US Bridges

Ia 136 over Branch Maquoketa River

Fair

Dubuque County, Iowa · 0.9 Mi. N of Jct. US 151 · Structure no. 000000000024110

Built
1934
91 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete Continuous
Length
28 ft
2 main spans
Daily traffic
2,140
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 136 over Branch Maquoketa River is a concrete continuous culvert carrying Ia 136 over Branch Maquoketa River in Dubuque County, Iowa. It was built in 1934, so it is 91 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 2,140 vehicles a day, roughly 17% of them trucks, projected to reach 2,140 by 2044. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIa 136
CrossesBranch Maquoketa River
Location0.9 Mi. N of Jct. US 151
RouteState Highway 136
CountyDubuque County
StateIowa
Coordinates42.31213, -91.03439
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34 US tons
Inventory rating25 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 20
Structure length28 ft (8.5 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,140 (2022)
Projected traffic2,140 by 2044
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Branch Maquoketa River built?

It was built in 1934, making it 91 years old in 2025.

What condition is Ia 136 over Branch 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 2024.

How much traffic does Ia 136 over Branch Maquoketa River carry?

About 2,140 vehicles per day (2022 count), of which roughly 17% are trucks.

How long is Ia 136 over Branch Maquoketa River?

The structure is 28 ft (8.5 m) long with a longest span of 10 ft (3 m).

Who owns Ia 136 over Branch Maquoketa River?

It is owned by the State Highway Agency.