US Bridges

Kimball Ave over US 20

Good

Black Hawk County, Iowa · 0.5 Mi. W of Jct. Ia 21 · Structure no. 000000000605215

Built
1984
41 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
268 ft
4 main spans
Daily traffic
6,868
2022 count
Owner
State
State Highway Agency

About this bridge

Kimball Ave over US 20 is a prestressed concrete stringer/multi-beam or girder carrying Kimball Ave over US 20 in Black Hawk County, Iowa. It was built in 1984, so it is 41 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 6,868 vehicles a day, projected to reach 6,868 by 2043. The structure is 268 ft (81.7 m) long and 57 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKimball Ave
CrossesUS 20
Location0.5 Mi. W of Jct. Ia 21
RouteCity Street 0
CountyBlack Hawk County
StateIowa
Coordinates42.45298, -92.35665
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99.8 US tons
Inventory rating43.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length268 ft (81.7 m)
Longest span92 ft (28 m)
Deck width57 ft (17.4 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,868 (2022)
Projected traffic6,868 by 2043
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Kimball Ave over US 20 built?

It was built in 1984, making it 41 years old in 2025.

What condition is Kimball Ave over US 20 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 February 2023.

How much traffic does Kimball Ave over US 20 carry?

About 6,868 vehicles per day (2022 count).

How long is Kimball Ave over US 20?

The structure is 268 ft (81.7 m) long with a longest span of 92 ft (28 m) and a deck 57 ft wide.

Who owns Kimball Ave over US 20?

It is owned by the State Highway Agency.