By this fall, you may be able to soar over the Colorado River from Eagle Rim Park and land in Las Colonias on a zipline installed by local outdoor recreation company Bonsai Design. Bonsai submitted an application for the new park feature earlier this month and is still working through the planning process with the city of Grand Junction, Bonsai owner and CEO Thaddeus Shrader said. However, he said they are itching to get moving and expect to have the zipline ready by fall. âRight now, everybody agrees that Bonsai wants to build it this summer,â Shrader said. âWeâre going to have it under construction this summer, and weâre hoping to have it usable by the end of the summer.â