GET READY! 9/14/14. The TRIFECTA Triathlon is about experience. Experience the beautiful confines of Possum Kingdom Lake – the ‘Great Lake of Texas’. Experience an epic swim with the infamous ‘Hells Gate’ staring at you. Experience the spectacular bike & run courses. Experience the Saturday Night Picnic at the YMCA Camp Grady Spruce. Experience the event amenities - dry fit shirt, visor, bag, personalized race bibs, and much more.