Cold temperatures have preserved the snow pack at the headwaters of the Carson River, even though not much in the way of additional precipitation has been added during the first half of January.Natural Resources Conservation Service sensors at Ebbetts Pass shows a snow depth of 5 feet with a snow-water equivalent of 21.7 inches. During the month, Ebbetts Pass added 1.4 inches of snow water equivalent, but lost 5 inches in snow depth so far during the month.Ebbetts Pass is at 130 percent of snow water equivalent and 132 percent of precipitation so far this year.As of the beginning of …