People huddled under umbrella on Caveman Bridge, Grants Pass / announcer interviews young man / pans across crowd in park from bridge / spectators snack / pan across hydroplane boats as they depart from riverbank / boats speed past camera / officials in vests  / parachutists fall into Rogue River, aiming for inner-tube target / announcer narrates / more boats speed past / announcer with microphone interviews winner (no sound), pan to trophies