US Bridges

US 20 over Dry Run Creek

Good

Black Hawk County, Iowa · 0.3 Mi. W of Jct. Ia 58 · Structure no. 000000000605625

Built
1985
40 years old
Condition
Good
inspected April 2024
Type
Culvert
Concrete Continuous
Length
45 ft
3 main spans
Daily traffic
12,700
2022 count
Owner
State
State Highway Agency

About this bridge

US 20 over Dry Run Creek is a concrete continuous culvert carrying US 20 over Dry Run Creek in Black Hawk County, Iowa. It was built in 1985, so it is 40 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 12,700 vehicles a day, roughly 21% of them trucks, projected to reach 12,700 by 2044. The structure is 45 ft (13.8 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesUS 20
CrossesDry Run Creek
Location0.3 Mi. W of Jct. Ia 58
RouteU.S. Route 20
StateIowa
Coordinates42.46487, -92.47212
Functional classUrban Other Principal Arterial

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.9 US tons
Inventory rating32.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20
Structure length45 ft (13.8 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,700 (2022)
Projected traffic12,700 by 2044
Trucks21%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 20 over Dry Run Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is US 20 over Dry Run 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 April 2024.

How much traffic does US 20 over Dry Run Creek carry?

About 12,700 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is US 20 over Dry Run Creek?

The structure is 45 ft (13.8 m) long with a longest span of 14 ft (4.3 m).

Who owns US 20 over Dry Run Creek?

It is owned by the State Highway Agency.