From Openwaterpediaopen water swimming competition at the Tex Robertson Highland Lakes Challenge, a 5-day stage race held in 5 separate lakes near Austin, Texas, U.S.A. The race is traditionally held in mid-October and consists of the Monster Challenge, theMini-Challenge, and single-stage swims. It is hosted and organized by the American Swimming Association under the direction of Dr. Keith Bell and Sandy Neilson-Bell.
The Monster Challenge consists of five open water swimming races averaging 3 miles each day for 5 consecutive days. The final placing is determined by the cumulative time for all 5 stages. The total distance is 15.6 miles with the expected water temperature between 25.5-26.6°C (78-80°F)
It was named one of America's Top 100 Open Water Swims.
Stage 1 on Day 1 is in Lake Buchanan
Stage 2 on Day 2 is in Inks Lake
Stage 3 on Day 3 is in Lake LBJ
Stage 4 on Day 4 is in Lake Marble Falls
Stage 5 on Day 5 is in Lake Travis
Each day's stage race begins at 9:00 am. No wetsuits are allowed. The water temperature is between 25.5-26.6°C (78-80°F).