The city has an active trail-building community, creating a system of trails that are being integrated into new housing developments and parks. Most of the trail-work has been completed by volunteers and the Washington Conservation Corps, sponsored by the city of Newcastle. The trail system will eventually lead all the way to Lake Washington to the west, in conjunction with Renton, and is already connected to Cougar Mountain Regional Wildland Park to the east, which is in unincorporated King County.