280th Street W. (County Road 86) Roundabouts
County Projects 86-44 and 86-43
Dakota County will construct two single lane roundabouts. The roundabout will be at:
- 280th Street W. (County Road 86) and Chippendale Avenue (Highway 3) within Castle Rock and Waterford townships
- 280th Street W. (County Road 86) and Randolph Boulevard/Emery Avenue (Highway 56) within Randolph and Hampton townships
The purpose of the project is to improve safety and traffic operations. Construction includes constructing single lane roundabouts, restriping, and drainage improvements.
Road closures and detours
The intersection of 280th Street W. (County Road 86) and Chippendale Avenue (Highway 3) is now closed for the construction of the roundabout. Please follow the posted detour.
County Road 86 and Highway 3 Detour Map
Construction progress
Aug. 14–22
Highway 3 roundabout
- Continue grading and excavating for the new roadway
- Continue installing storm sewer
- Continue placing gravel for the new roadway
- Relocating temporary lines to move out of the way for the roadway grading
Community engagement
The county hosted a public open house on Sept, 16, 2024 at the St. Mark's Lutheran Church, 28595 Randolph Blvd., Randolph.
The county hosted a public open house on Monday, Aug. 11, 2025 at the St. Mark's Lutheran Church, 28595 Randolph Blvd., Randolph.
Project timeline
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Preliminary and final engineering design
February 2024–spring 2025
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Public engagement
Fall 2024–spring 2025
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Right of way acquisition
Fall 2024–summer 2025
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Construction at 280th Street W. (County Road 86) and Randolph Boulevard/Emery Avenue (Highway 56)
May-August 2026
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Construction at 280th Street W. (County Road 86) and Chippendale Avenue (Highway 3)
May-September 2026
For more information
Dakota County Roundabout Education
Email updates
To receive email updates for this project, email Stacy Reilly at stacy.reilly@co.dakota.mn.us. Please include “CP 86-43, 86-44 Updates" in the subject line.