BRIDGEPORT, Conn. -- Aquarion Water Co. closed public access to the Putnam Dam in Greenwich Thursday, citing concerns about terrorism and the war in Iraq. No trespassing signs were posted around the dam, and a gate was installed near the spillway to block access by walkers. "In light of Aquarion's heightened alert status and our commitment to do everything we can to protect our public drinking water supplies, Putnam area residents, visitors and all pets are restricted from the Putnam Dam area," said David Medd, operations manager. "Visitors will be subject to arrest." ... Aquarion is one of the 10...