This field trip was special because only a selected few individuals are allowed access to the ranch in the Frio Canyon. Leader, Ken Cave, is personally acquainted with the owners, so he has free access. Before starting our hike, Ken discussed the aquatic biology and hydrogeology of the Frio Canyon, using a flip chart and hand-outs. The clearest and cleanest streams in Texas originate in the Texas Hill Country River Region. The focus of this field trip was on spring and recharge habitat dynamics.