This overlay district includes those lands designated as environmental corridor by the Southeastern Wisconsin Regional Planning Commission (SEWRPC) in 2015 that are not otherwise part of a conservancy (C-1) district. This district is intended to preserve, protect, enhance, and restore those areas, while also affording an opportunity to use the site for limited residential purposes, in concert with the goal and intent of the county development plan and the town comprehensive plan, which suggests that residential densities in such areas not exceed one unit per five acres for all lots, which lie entirely within the environmental corridor.