US Bridges

Ia 3 over N Fork Little Maquoketa

Fair

Dubuque County, Iowa · 5.9 Mi. W of Jct. SR C9Y · Structure no. 000000000024030

Built
1967
58 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
154 ft
3 main spans
Daily traffic
1,680
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 3 over N Fork Little Maquoketa is a prestressed concrete stringer/multi-beam or girder carrying Ia 3 over N Fork Little Maquoketa in Dubuque County, Iowa. It was built in 1967, so it is 58 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 1,680 vehicles a day, roughly 8% of them trucks, projected to reach 1,680 by 2044. The structure is 154 ft (46.9 m) long and 35 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

Location

Open in Google Maps
CarriesIa 3
CrossesN Fork Little Maquoketa
Location5.9 Mi. W of Jct. SR C9Y
RouteState Highway 3
CountyDubuque County
StateIowa
Coordinates42.56916, -90.80561
Functional classRural Principal Arterial - Other

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.5 US tons
Inventory rating42.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length154 ft (46.9 m)
Longest span57 ft (17.4 m)
Deck width35 ft (10.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,680 (2022)
Projected traffic1,680 by 2044
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemYes

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 3 over N Fork Little Maquoketa built?

It was built in 1967, making it 58 years old in 2025.

What condition is Ia 3 over N Fork Little Maquoketa 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 3 over N Fork Little Maquoketa carry?

About 1,680 vehicles per day (2022 count), of which roughly 8% are trucks.

How long is Ia 3 over N Fork Little Maquoketa?

The structure is 154 ft (46.9 m) long with a longest span of 57 ft (17.4 m) and a deck 35 ft wide.

Who owns Ia 3 over N Fork Little Maquoketa?

It is owned by the State Highway Agency.