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Main street in downtown Lake Elmo

CSAH 17 Corridor Management and Safety Improvements


Main Street in downtown Lake Elmo, Minnesota, is also a County Highway – and it needed a complete overhaul to address infrastructure needs. The downtown area required a new sanitary sewer system to replace failing septic systems, a new stormwater system to reduce flooding and the reconstruction of water main that was old and experiencing frequent breaks.


The City and County worked together to construct a new sanitary and storm sewer system/regional pond and water main along a 1.5-mile corridor. The upgrades also included a new streetscape in the downtown area. SEH worked with the City and County to determine the best approach to locate and phase construction in the downtown area, and also addressed parking, grade and new sidewalk issues. The project team determined long and short-range drainage solutions to reduce flooding and built a regional treatment basin that resulted in water quality treatment credits for future downtown development.


  • 2017 Honorable Mention Award | American Public Works Association – Minnesota Chapter (APWA-MN)

Project Name
CSAH 17 (Lake Elmo Avenue) Corridor Management and Safety Improvements

Lake Elmo, Minnesota


  • Washington County Department of Transportation
  • City of Lake Elmo, Minnesota


  • Regional stormwater management plan
  • New sanitary sewer main design
  • Water main replacement
  • Drainage design
  • Landscaping
  • Planting beds
  • Ornamental lighting
  • Pedestrian traffic calming features
  • Public Engagement
  • Construction Services
  • Preliminary and Construction Survey