US Bridges

Dunkerton RD over US 218

Good

Black Hawk County, Iowa · At Jct. Dunkerton Rd. · Structure no. 000000000601605

Built
1995
30 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
227 ft
2 main spans
Daily traffic
599
2022 count
Owner
State
State Highway Agency

About this bridge

Dunkerton RD over US 218 is a steel continuous stringer/multi-beam or girder carrying Dunkerton RD over US 218 in Black Hawk County, Iowa. It was built in 1995, so it is 30 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 599 vehicles a day, projected to reach 599 by 2043. The structure is 227 ft (69.2 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesDunkerton RD
CrossesUS 218
LocationAt Jct. Dunkerton Rd.
RouteCity Street 0
CountyBlack Hawk County
StateIowa
Coordinates42.57081, -92.42845
Functional classUrban Collector

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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.9 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length227 ft (69.2 m)
Longest span112 ft (34.1 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic599 (2022)
Projected traffic599 by 2043
Trucks0%
Lanes on structure2
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 Dunkerton RD over US 218 built?

It was built in 1995, making it 30 years old in 2025.

What condition is Dunkerton RD over US 218 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 July 2023.

How much traffic does Dunkerton RD over US 218 carry?

About 599 vehicles per day (2022 count).

How long is Dunkerton RD over US 218?

The structure is 227 ft (69.2 m) long with a longest span of 112 ft (34.1 m) and a deck 43 ft wide.

Who owns Dunkerton RD over US 218?

It is owned by the State Highway Agency.