Thor's Well is located about 5 minutes south of Yachats Oregon. Park at the viewpoint just before the "Cooks Chasm" sign. The trick with photographing Thor's well is to get a high tide right near sunset and have the right weather, all while trying to stay dry.
After parking at the view point, the trail is at the north end of the parking area. It’s only a short walk down to the beach. Be very careful. You have to walk out onto the walk pretty far to reach Thor’s Well and at high tide sneaker waves are capable of washing over the entire rock area.