Sep 06, 2007 — The north end of Lake Champlain sits on the Atlantic Flyway, a crucial travel corridor for millions of migratory birds heading south for the winter. It's also home to Vermont's largest great blue heron rookery. But Missisquoi Bay is also one of the most polluted bodies of water in the North Country. Every year, tons of phosphorous-rich manure from nearby dairy farms seeps down into the lake. In recent years, that pollution has triggered gooey algae blooms. Critics say farmers and government regulators need to do far more to cut phosphorous pollution. Industry leaders are pushing back. As Brian Mann reports, many farmers insist that voluntary programs and self-regulation are still the best solution.