The Ontario Ministry of Transportation (MTO) is undertaking a Detail Design and Class Environmental Assessment for the replacement of the Highway 400 North Canal Overpass structure located in the Holland Marsh. The Holland Marsh is located in the Town of Bradford West Gwillimbury in the County of Simcoe.

The preliminary design was documented in the Highway 400 Planning Study from the South Canal Bridge Northerly to 1 km South of Highway 89 Transportation Environmental Study Report (2003) that received environmental clearance in the Summer of 2005.

Since 2005, there have been changes in the study area, including the realignment of the North Canal and updated information about the condition of the bridges. These changes led to the initiation of this study. As part of this study, a Design and Construction Report (DCR) will be prepared and made available for a 30-day public review period. A Public Information Centre for this study was held on March 30, 2016 to display and seek input on the proposed improvements. This website will be maintained for the duration of the study and updated as new information becomes available.