Dan Gillikin surveyed the view from his front window and didn’t like what he saw. The Aniak River, which runs alongside his house, was a jumble of car-sized chunks of ice. Breakup on the nearby Kuskokwim River had pushed a frozen snarl down the Aniak, making it impassable. “I’m basically looking at Armageddon right now,” he said, describing the scene by phone in early May.