US Bridges

Ia 38 over Maquoketa River

Fair

Jones County, Iowa · 1.5 Mi. N of Jct. SR D62 · Structure no. 000000000032391

Built
1974
51 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
388 ft
3 main spans
Daily traffic
3,310
2022 count
Owner
State
State Highway Agency

About this bridge

Ia 38 over Maquoketa River is a steel continuous stringer/multi-beam or girder carrying Ia 38 over Maquoketa River in Jones County, Iowa. It was built in 1974, so it is 51 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 3,310 vehicles a day, roughly 7% of them trucks, projected to reach 3,310 by 2044. The structure is 388 ft (118.3 m) long and 48 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesIa 38
CrossesMaquoketa River
Location1.5 Mi. N of Jct. SR D62
RouteState Highway 38
CountyJones County
StateIowa
Coordinates42.25941, -91.19256
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 protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.7 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length388 ft (118.3 m)
Longest span150 ft (45.7 m)
Deck width48 ft (14.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,310 (2022)
Projected traffic3,310 by 2044
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 38 over Maquoketa River built?

It was built in 1974, making it 51 years old in 2025.

What condition is Ia 38 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 2024.

How much traffic does Ia 38 over Maquoketa River carry?

About 3,310 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is Ia 38 over Maquoketa River?

The structure is 388 ft (118.3 m) long with a longest span of 150 ft (45.7 m) and a deck 48 ft wide.

Who owns Ia 38 over Maquoketa River?

It is owned by the State Highway Agency.