Can you hear the screaming from where you are? That's Silver Lake residents with a view of the water reacting as DWP workers roll millions of little plastic balls down the banks and into the reservoir, an unconventional way to cover up the water and prevent cancer-linked bromate from forming.
A full story about the balls and the bromate and the future of the man-made lakes from our own hard-working Francisco Vara-Orta is on the way. In the meantime, feel free to stare at these pix and marvel at the strange world in which we live.
Edit: The balls are made of high density poly-ethylene (HDPE) by a company called ECC. They were originally intended for covering up mining water pits, to prevent birds from landing in them and dying from the chemicals. They've since expanded them to other uses, including shielding water from UV light. (How much longer you think before people start stealing the balls and putting them up on EBay?)