The broadcast will be Oct. 19, 5am to 9am. Martin Marietta limestone mine, 831 E Riverside Rd, just north of Ames. Exit 113 off I-35 west to Dayton Road (2nd stoplight). Go north on Dayton exactly 2 miles to the first paved road to the west (Riverside Road). Go west on Riverside to the Martin Marietta gates and follow traffic control to park.