Highway 3/Robert Street

Stormwater management

We are planning to incorporate stormwater management features as a part of this project. Managing stormwater runoff is a way to reduce pollutants from reaching nearby lakes, rivers and streams. It also helps retain water on the landscape, where it can be useful to keep grass and trees healthy.

Infiltration boulevards, a type of green infrastructure located within the boulevard space between the curb and sidewalk, will be a key part of the project.

Infiltration boulevards

Infiltration boulevards are shallow depressions in the boulevard that are designed to absorb water. Infiltration boulevards may include turf grass and trees and are designed using a specialized soil mixture that is loose enough to allow for greater absorption.

Property impacts

The addition of an infiltration boulevard may affect how the boulevard space in front of properties along the area can be managed and used.

Because infiltration boulevards are designed to absorb water, it's important that nothing be added or built within the infiltration area that could interfere with drainage or alter the depth of the basin. This includes raised garden beds, additional soil or mulch, or large landscaping features.

Vehicles, trailers or other heavy objects also should not be parked or stored in the area, as compacted soil can reduce the boulevard’s ability to absorb water properly. Routine activities such as mowing the grass and general upkeep around the boulevard can continue.

MnDOT will provide additional information regarding maintenance responsibilities and how the infiltration boulevard will function once constructed.

Next steps

MnDOT has identified locations where infiltration boulevards will be incorporated along Robert St. between Annapolis St. and Kellogg Blvd.

As design work continues, MnDOT will reach out to impacted property owners with more information.