Grom85 is correct.

Mission Viejo Lake is a private lake only open to members. To become a member, you must either buy a house in Mission Viejo and transfer the previous owner's membership to yourself (if the previous owners were members), or buy a house in Mission Viejo and start a new membership. Membership is permanent.

You may fish at the lake as a guest of a member. Cost is $8.00/day last time I checked.