The 5,600-ft long tunnel lies 70-ft below ground and features a variable diameter between 22-ft and 27-ft. By catching floodwaters between Waterloo Park and Lady Bird Lake, the tunnel effectively reduces flood risk for downtown Austin. The tour promises to be both informative and interesting, but is restricted to the first 20 registrants. All participants will be required to wear closed-toed shoes. Registration and additional information can be found at our website (https://www.austinasce.org/sei/). Tour information can be found below. Be sure to register soon as it will fill up fast!