Three Calero trips to talk about.
First trip was in the middle of December before the rains. Had to dropshot at around 40 feet of water to pick up 3. Water was low and cold. Very tough bite, and if you were fishing from shore you were probably s't out of luck. They were very deep.
Fished this past Friday and Saturday after all the rains. I was hoping the water would be high, providing new cover for the fish. Unfortunately, I guess they let out a lot of water as the water level was about the same, except a lot muddier. Cold, muddy, low water, minimal wind. Possibly the WORST conditions you can fish a reservoir already devoid of shoreline cover. Friday I tried fishing shallow anyway and couldn't catch anything. Saturday, I fished a jig very slow over rocks. Caught one fish, probably hit it on its head. Depth finder showed fish scattered.
Hoping these rains cause the water level to rise! Knowing how they manage our reservoirs probably not though....
I also did two trips to Berryessa and the Delta in December. Both areas we used dropshots and jerkbaits and were able to catch them. If the water stays cold, low, and muddy, I would invest the time to go to those places instead of Calero!