Rain may interfere with your weekend plans, but it should continue to help Lake Lanier. “Comparing with what usually happens when we get 2 to 3 inches of rainfall, we could see Lake Lanier rise 2 to 3 feet,” said meteorologist George Wetzel of the National Weather Service in Peachtree City. The lake was at 1,065.34 feet above sea level as of 10:15 p.m. Thursday night.