JAFFREY — The Thorndike Pond Conservation Association will take steps this fall to expand the sidewalls and increase the height of the dam on Thorndike Pond by approximately 1 foot. While construction will take about 30 days, Town Manager Dave Caron said in a recent interview with the Ledger-Transcript that the dam must first be relieved of five feet of water. The draw down, he noted, is slated to begin … 0