Bass will move deeper as the water cools to establish their winter base of operation. The deeper coves with a defined creek channel, longer points that drop off into secondary or primary creek channels, or a shoreline where the bottom has a fast drop off, causing a stair step effect are the best places to start exploring for action. The other primary factor that needs to be in all of these spots is wood. Bass tend to prefer wood in the colder months. You want to find creek edges with trees along them, tree lines running down points into deep water, and stumps or brush piles along contour steps going into deep water.
Boat docks with wood pilings going into deeper water are also good.
If activity on the upper end of the lake begins to slow down it may be because of the water temperature. Go down the lake toward the dam and deeper water. The deeper areas of the lake will cool slower and are not affected as much by air temperature changes from cold fronts as the upper end or shallower areas of the lake. There can be as much as 10 degrees in temperature difference from the upper end of the lake to the dam. Try to look for the areas with warmer water, it will improve your chances of catching fish.