Avista Corp. will begin its annual drawdown of Lake Coeur d’Alene on Tuesday. The lake will be lowered about a foot by the end of September and an additional foot and a half per month after that, until it reaches its winter level, a news release from Avista said. Property owners and boaters should take measures to secure docks and boats for the winter. Avista’s federal license to operate its dams on the Spokane River requires that it maintain the level of Lake Coeur d’Alene at or near the “full-pool” elevation of 2,128 feet from early spring until the Tuesday after Labor Day. The river should be open to recreation until November; however, river users should be aware of fluctuating levels. People can see waterflow information at avistautilities.com/waterflow or by calling (509) 495-8043 in Washington or (208) 769-1357 in Idaho.