The Corps of Engineers has developed a system of Action Zones to manage and react to changing water levels on Lake Lanier:
Zone 1 indicates that releases can be made in support of seasonal navigation (when the channel has been adequately maintained), hydropower releases and water quality releases. If the all corps lakes on the Apalachicola-Chattahoochee -Flint waterway are in Zone 1 or above, the river system would operate in a fairly normal manner. Designated swim areas are open, but the water level is approximately 3-4 feet at the deepest point in the designated swim area vice the usual 6-7 feet depth. Boat ramps are not affected.
Zone 2 indicates that water to support seasonal navigation may be limited. Hydropower generation is supported at a reduced level. Water supply and water quality releases are met. Minimum flow targets are met. Some designated swim areas are unusable. Most of the boat ramps are open. Navigation aids may be posted to remind boaters to use caution when operating near the shoreline and to be aware of potential submerged obstacles.
Zone 3 indicates that water to support seasonal navigation may be significantly limited. Hydropower generation is supported at a reduced level. Water supply and water quality releases are met. Minimum flow targets are met. Most designated swim areas are unusable. Most boat ramps are open. Navigation aids may be posted to remind boaters to use caution when operating near the shoreline and to be aware of potential submerged obstacles.
Zone 4 indicates that navigation is not supported. Hydropower demands will be met at minimum level and may only occur for concurrent uses. Water supply and water quality releases are met. Minimum flow targets are met. Designated swim areas are unusable. Many boat ramps become unusable in early fall. Navigation aids may be posted to remind boater to use caution when operating near the shoreline and to be aware of potential submerged obstacles.