Graf RD over Little Maquoketa River

Fair

Dubuque County, Iowa · 089E13203 · Structure no. 000000000147161

Built: 2006; 19 years old
Condition: Fair; inspected June 2023
Type: Slab; Concrete Continuous
Length: 125 ft; 3 main spans
Daily traffic: 560; 2022 count
Owner: County; County Highway Agency

About this bridge

Graf RD over Little Maquoketa River is a concrete continuous slab carrying Graf RD over Little Maquoketa River in Dubuque County, Iowa. It was built in 2006, so it is 19 years old, younger 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.

It carries about 560 vehicles a day, projected to reach 560 by 2043. The structure is 125 ft (38.1 m) long and 33 ft wide.

Location

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CarriesGraf RD

CrossesLittle Maquoketa River

Location089E13203

RouteCounty Highway 0

CountyDubuque County

StateIowa

Coordinates42.48381, -90.87671

Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

Component	Rating	Meaning
Deck	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure	5 Fair	All primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure	7 Good	Some minor problems.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionJune 2023

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is

Deck geometry6: Equal to present minimum criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment8: Equal to present desirable criteria

Operating rating97.6 US tons

Inventory rating58.3 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length125 ft (38.1 m)

Longest span49 ft (14.9 m)

Deck width33 ft (10.2 m)

Roadway width31 ft (9.3 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic560 (2022)

Projected traffic560 by 2043

Trucks0%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed—

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 Graf RD over Little Maquoketa River built?

It was built in 2006, making it 19 years old in 2025.

What condition is Graf RD over Little 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 June 2023.

How much traffic does Graf RD over Little Maquoketa River carry?

About 560 vehicles per day (2022 count).

How long is Graf RD over Little Maquoketa River?

The structure is 125 ft (38.1 m) long with a longest span of 49 ft (14.9 m) and a deck 33 ft wide.

Who owns Graf RD over Little Maquoketa River?

It is owned by the County Highway Agency.