In this line of work, projects don’t start with a bang. They end with one. With a booming explosion on Tuesday morning, a portion of stream at the headwaters of Big Haymeadow Creek in Langlade County again flowed freely, a beaver dam blasted out of the way. Jeremy Irish, an assistant district supervisor with the USDA’s Wildlife Services program, triggered the blast, undoing some of this year’s construction by beavers in the area. In the process, he cleared another portion of one of northern