US Bridges

US 30 over Storm Creek

Fair

Carroll County, Iowa · 2.5 Mi. W. of Jct. SR N41 · Structure no. 000000000017110

Built
1955
70 years old
Condition
Fair
inspected February 2023
Type
Slab
Concrete Continuous
Length
122 ft
3 main spans
Daily traffic
7,300
2022 count
Owner
State
State Highway Agency

About this bridge

US 30 over Storm Creek is a concrete continuous slab carrying US 30 over Storm Creek in Carroll County, Iowa. It was built in 1955, so it is 70 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 5 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 7,300 vehicles a day, roughly 10% of them trucks, projected to reach 7,300 by 2042. The structure is 122 ft (37.2 m) long and 35 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesUS 30
CrossesStorm Creek
Location2.5 Mi. W. of Jct. SR N41
RouteU.S. Route 30
CountyCarroll County
StateIowa
Coordinates42.06377, -94.77308
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating37.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length122 ft (37.2 m)
Longest span45 ft (13.7 m)
Deck width35 ft (10.6 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,300 (2022)
Projected traffic7,300 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Storm Creek built?

It was built in 1955, making it 70 years old in 2025.

What condition is US 30 over Storm 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 February 2023.

How much traffic does US 30 over Storm Creek carry?

About 7,300 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is US 30 over Storm Creek?

The structure is 122 ft (37.2 m) long with a longest span of 45 ft (13.7 m) and a deck 35 ft wide.

Who owns US 30 over Storm Creek?

It is owned by the State Highway Agency.