US 63 over Middle Creek

Fair

Mahaska County, Iowa · 3.3 Mi. S of Jct. Ia 146 · Structure no. 000000000034910

Built: 1961; 64 years old
Condition: Fair; inspected March 2024
Type: Slab; Concrete Continuous
Length: 127 ft; 3 main spans
Daily traffic: 4,320; 2022 count
Owner: State; State Highway Agency

About this bridge

US 63 over Middle Creek is a concrete continuous slab carrying US 63 over Middle Creek in Mahaska County, Iowa. It was built in 1961, so it is 64 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 4,320 vehicles a day, roughly 13% of them trucks, projected to reach 4,320 by 2042. The structure is 127 ft (38.7 m) long and 36 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesUS 63

CrossesMiddle Creek

Location3.3 Mi. S of Jct. Ia 146

RouteU.S. Route 63

CountyMahaska County

StateIowa

Coordinates41.42119, -92.65123

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	7 Good	Some minor problems.
Channel and channel protection	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionMarch 2024

Inspection intervalevery 24 months

Operating statusOpen, no restriction

ScourFoundations stable; scour within limits of footing or piles

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 rating68.7 US tons

Inventory rating41.2 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length127 ft (38.7 m)

Longest span48 ft (14.6 m)

Deck width36 ft (11 m)

Roadway width30 ft (9.1 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,320 (2022)

Projected traffic4,320 by 2042

Trucks13%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed9.9 mi (16 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 US 63 over Middle Creek built?

It was built in 1961, making it 64 years old in 2025.

What condition is US 63 over Middle 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 March 2024.

How much traffic does US 63 over Middle Creek carry?

About 4,320 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is US 63 over Middle Creek?

The structure is 127 ft (38.7 m) long with a longest span of 48 ft (14.6 m) and a deck 36 ft wide.

Who owns US 63 over Middle Creek?

It is owned by the State Highway Agency.