US 30 over Rock Creek

Fair

Cedar County, Iowa · 0.6 MI W of W Jct. Ia 38 · Structure no. 000000000018261

Built: 1973; 52 years old
Condition: Fair; inspected June 2023
Type: Slab; Concrete Continuous
Length: 103 ft; 3 main spans
Daily traffic: 4,410; 2022 count
Owner: State; State Highway Agency

About this bridge

US 30 over Rock Creek is a concrete continuous slab carrying US 30 over Rock Creek in Cedar County, Iowa. It was built in 1973, so it is 52 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 4,410 vehicles a day, roughly 19% of them trucks, projected to reach 4,410 by 2042. The structure is 103 ft (31.4 m) long and 48 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

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CarriesUS 30

CrossesRock Creek

Location0.6 MI W of W Jct. Ia 38

RouteU.S. Route 30

CountyCedar County

StateIowa

Coordinates41.88844, -91.16309

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 inspectionJune 2023

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 geometry9: Superior to present desirable criteria

Waterway adequacy6: Equal to present minimum criteria

Approach roadway alignment7: Better than present minimum criteria

Operating rating59.4 US tons

Inventory rating31.7 US tons

Structure

Structure typeSlab

MaterialConcrete Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20

Structure length103 ft (31.4 m)

Longest span39 ft (11.9 m)

Deck width48 ft (14.5 m)

Roadway width44 ft (13.5 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,410 (2022)

Projected traffic4,410 by 2042

Trucks19%

Lanes on structure2

Traffic directionTwo-way traffic

CarriesHighway

CrossesWaterway

Detour if closed14.3 mi (23 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 30 over Rock Creek built?

It was built in 1973, making it 52 years old in 2025.

What condition is US 30 over Rock 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 US 30 over Rock Creek carry?

About 4,410 vehicles per day (2022 count), of which roughly 19% are trucks.

How long is US 30 over Rock Creek?

The structure is 103 ft (31.4 m) long with a longest span of 39 ft (11.9 m) and a deck 48 ft wide.

Who owns US 30 over Rock Creek?

It is owned by the State Highway Agency.