US Bridges

US 30 over Clear Creek

Good

Cedar County, Iowa · 3.2 Mi. W of Sec. Rd. X40 · Structure no. 000000000018251

Built
1987
38 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
5,500
2022 count
Owner
State
State Highway Agency

About this bridge

US 30 over Clear Creek is a concrete continuous culvert carrying US 30 over Clear Creek in Cedar County, Iowa. It was built in 1987, so it is 38 years old, younger than the Iowa average of 45.5 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,500 vehicles a day, roughly 15% of them trucks, projected to reach 5,500 by 2042. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 24.2 mi (39 km).

CarriesUS 30
CrossesClear Creek
Location3.2 Mi. W of Sec. Rd. X40
RouteU.S. Route 30
StateIowa
Coordinates41.91803, -91.31712
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating39.2 US tons
Inventory rating30.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,500 (2022)
Projected traffic5,500 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 Clear Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is US 30 over Clear Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does US 30 over Clear Creek carry?

About 5,500 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is US 30 over Clear Creek?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns US 30 over Clear Creek?

It is owned by the State Highway Agency.