US Bridges

NB US 61 over Prairie Creek

Fair

Jackson County, Iowa · 2.0 Mi. S Jct. of Ia. 64 · Structure no. 000000000030140

Built
1967
58 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete Continuous
Length
144 ft
3 main spans
Daily traffic
4,600
2022 count
Owner
State
State Highway Agency

About this bridge

NB US 61 over Prairie Creek is a concrete continuous slab carrying NB US 61 over Prairie Creek in Jackson 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 4,600 vehicles a day, roughly 20% of them trucks, projected to reach 4,600 by 2042. The structure is 144 ft (43.9 m) long and 36 ft wide.

Location

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CarriesNB US 61
CrossesPrairie Creek
Location2.0 Mi. S Jct. of Ia. 64
RouteU.S. Route 61
CountyJackson County
StateIowa
Coordinates42.04556, -90.66917
Functional classUrban Other Principal 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.9 US tons
Inventory rating46.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length144 ft (43.9 m)
Longest span56 ft (17.1 m)
Deck width36 ft (11 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,600 (2022)
Projected traffic4,600 by 2042
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
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 NB US 61 over Prairie Creek built?

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

What condition is NB US 61 over Prairie Creek 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 NB US 61 over Prairie Creek carry?

About 4,600 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is NB US 61 over Prairie Creek?

The structure is 144 ft (43.9 m) long with a longest span of 56 ft (17.1 m) and a deck 36 ft wide.

Who owns NB US 61 over Prairie Creek?

It is owned by the State Highway Agency.