Fifteen years ago, Nancy Merrill was part of an effort to create an annual festival in Steamboat Springs to celebrate one of Northwest Colorado’s most recognized summer visitors — the sandhill crane. “I’m really happy with what it is today,” Merrill said of the festival. “It has surpassed all my expectations. We threw that first festival together in a very short time and had no idea whether it would be a one-time thing or would continue through …