Scenic and challenging 10 mile and 5k trail race through beautiful Waterfall Glen Forest Preserve in Darien, IL. Starting in the Argonne Family Park (in Waterfall Glen), the course quickly enters the Waterfall Glen’s crushed limestone main loop. Just before mile 3 is Big Bertha offering a 125 foot climb in a half mile. Water stations will be located about every 2 miles. USATF course certified #IL-06016-JW.