Lot 86 Gruenther Ridge is a deep walkout lot near the outlot. This lot is builder-attached to Colony Custom Homes. Gruenther Ridge, off 216th and Gruenther Road, in Gretna is a brand new subdivision featuring nearly 17 acres of green space along with a trail system and areas for future parks. Easy access to Highway 6 and 370. Gretna School District. Colony Custom Homes is a custom home building company serving the Omaha Metro Area. Call today for more information!