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Maplewood Mall Retrofit

This innovative project cleans 20 million gallons of stormwater each year.

Project details

City Maplewood
Subwatershed Kohlman Lake
Completed 2012
Cost $6.5 Million
Funding source(s) Clean Water Fund grants, MPCA 319 grant, TMDL Implementation grant, Green Project Reserve grant, Minnesota State Revolving Fund, District CIB Levy
Partners Simon Property Group, City of Maplewood, Ramsey County

Overview

With 35 acres of asphalt pavement and concrete surfaces surrounding it, Maplewood Mall was a major source of phosphorous runoff to nearby Kohlman Lake. Through a 4-year, multi-phase construction project, we installed a variety of features that now capture and filter 67 percent of rainwater at the mall, up from just 3 percent before the project.

The mall parking lot features innovative tree trenches, which use layers of angular granite to form a rock filter that slowly drains water into the local storm sewer. The main entrance is fitted with rain gardens, permeable pavers and a 5,700-gallon cistern that receives runoff from the mall roof. Interpretive signage and a conservation-themed mural draws attention to these improvements, and a large watershed map in the entry vestibule shows how water travels from the mall all the way to the Mississippi River.

The project received the Grand Award from the American Council of Engineering Companies, and it was named Project of the Year by the Minnesota Association of Watershed Districts.

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More information

Maplewood Mall Project Summary

Land & Water magazine article

Tree Trench Fact Sheet

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  • 2665 Noel Drive
  • Little Canada, MN 55117
  • P: 651-792-7950
  • E: office@rwmwd.org

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