Several Lake Wateree residents reported that their docks were underwater or inaccessible due to high lake levels Thursday. Duke Energy, which operates dams along the Catawba River basin, of which Lake Wateree is a part, alerted residents earlier this week to prepare for the rising water. It said significant rainfall had led the company to open spillways and floodgates along the chain so that water could flow at a “measured pace” to protect low-lying homes.