Longtime Austinite Ed Crowell, a former Austin American-Statesman editor and the author of the book Barton Creek, will be leading a guided hike to the upper waterfalls of the Lost Creek Greenbelt. Bring your swimsuit for an optional swim or snorkel – snorkel and masks provided. Few people know more about the ecology, the history and the politics of Barton Creek than Crowell, who is also on the board of the Save Barton Creek Association. Hydrologic technician Mark D. Hiler and Save Our Springs spokesperson Linzy Foster will be on hand at the beginning of the hike to discuss the USGS monitoring stations on Barton Creek and explain how to interpret stream monitoring data. Sunday, March 30, 8-11:30 a.m. Meet at Save Our Springs HQ at 3201 Menchaca to pick up a shuttle to the trailhead. Find more info and register for the hike here.