Runoff from weekend rainfall throughout Georgia and South Carolina had pushed Thurmond Lake's pool level up more than three feet by Wednesday.
But the U.S. Army Corps of Engineers, which manages the 70,000-acre lake for flood-control purposes, doesn't expect the reopening of Thurmond Dam's floodgates, as authorities did earlier this year.
"Right now it's still rising, but it's rising more slowly," said corps spokesman Jim Parker.
The reservoir's level before record-setting weekend rainfall was about 330 feet above sea level -- normal full pool. As of Wednesday afternoon, runoff from rains in upstate regions had pushed the pool to 333.09.
Although releases from the dam into the Savannah River were curtailed Monday to let local rainfall dissipate and flow downstream in the Savannah River, hydropower generation has since resumed.