A volunteer guide talks to Fox Grove Elementary students about the Tuolumne River ecosystem during a field trip at River Park in Waterford on May 9, 2016.
A volunteer guide talks to Fox Grove Elementary students about the Tuolumne River ecosystem during a field trip at River Park in Waterford on May 9, 2016. Nan Austin The Modesto Bee file
A volunteer guide talks to Fox Grove Elementary students about the Tuolumne River ecosystem during a field trip at River Park in Waterford on May 9, 2016. Nan Austin The Modesto Bee file