Roaring Springs Waterpark to open Saturday The park is opening a new $1.3 million water ride with a double corkscrew and two flying saucers. Credit: KTVB Author: KTVB Staff Updated: 12:09 PM MDT May 13, 2021 MERIDIAN, Idaho — Temperatures around the Treasure Valley are expected to climb into the 80s this weekend. If you are looking for a way to cool off, then you might want to head to Meridian. Roaring Springs Waterpark announced it will be opening this Saturday, May 15 at 11 a.m. Park officials say this marks the official start of summer in the Treasure Valley (even though summer doesn't actually start until June 21).