The reservoir level at Tulloch (expressed as an elevation in feet above sea level) fluctuates on a daily and seasonal basis, depending upon the operating needs of the US Bureau of Reclamation, the operators of New Melones, and the needs of Tri-Dam Project. During the winter months, the reservoir levels are lower to provide flood storage space if needed, and during the summer months water level fluctuations due to power generation can also occur. Residents and visitors are always urged to exercise care in and around the reservoir.