The Dubuque Community Y contracted with EBL to design and build the initial 7-zipline course. EBL resourcefully used Union Park’s natural valleys, ravines, hillsides, and bluffs to create an eco-friendly progression of seven (7) ziplines through the forested hills and valleys.

In May 2011, with construction of the Sky Tours Zipline completed, guides were trained and certified and the 7-zipline course was opened to the public for business. In January 2013, Sky Tours retained EBL to add additonal ziplines, expanding the tour to 9 ziplines, up to 1,000 feet long.