What is causing this?

What is causing this is the questions that the citizens of British Colombia’s Lake Okanagan are asking each other.  Are the ripples that you see in the photo caused by tides and waves in the lake hitting some rock formations underneath the lake?  Or is there something else causing this.  If you watch the video, you will notice that the ripples in the water suddenly stop.  Could it be possible that the tide changed or the moon’s gravitational pulled stopped suddenedly?  Many believe the cause of what you are seeing is from Canada’s version of the Loch Ness Monster.  No the monster cannot be seen in the video but the wave moments are interesting and a subject for debate.