The Emerald City Open Water Swim was the first event of its kind in the Seattle area. Dave Gertsch saw the need for an open water swim in Seattle after participating in similar events in California. He organized the first Emerald City Open Water Swim in August of 1984. In the events first year there were approximately 100 participants. Since then the swim has had as many as 500 swimmers. The swim has developed into a family event with entertainment, awards, and door prizes following the swim. There is at least one family who has three generations of swimmers who compete together each year. Participants enjoy trying to find the year of the swim, which is hidden in the T-shirt design, each year. Reportedly, the weirdest door prize awarded at the event was a free tattoo! Certified lifeguards are in the water to supervise the swim. Swimmers 17 and under must have parental approval to participate. Minimum age is 10 years.