Mary Mazzio’s ‘Bad River’ chronicles Wisconsin Native American community’s pipeline fight

“I didn’t know what that was, but I was, like, ‘Well, it’s got a paddle,’” said Mazzio, a Massachusetts native and onetime Olympic rower who’s as comfortable on the water as she is behind the camera. Before Mary Mazzio shot a single frame of “Bad River,” her new documentary about a Native community’s battle to remove a precarious pipeline from its reservation in northern Wisconsin, she was invited to do some “canoe diplomacy” with the tribe. It turned out to be an early-morning outing on Lake Superior with Mike Wiggins...