In 1966, the original structure was replaced with the single level, hunter style cabin. Castle Flats lies on the edge of the mud flats of the Castle River, on the west side of Duncan Canal. The cabin is 16 air miles, or 30 water miles, from Petersburg. The terrain is flat with little elevation gain. They have a brown enamel finish and a slightly domed top.
Water is available from a small stream west of the cabin.
Treat all water before using. A boat is provided at this cabin. The Castle River Trail is an easy hike through forest and muskeg. One-half mile upriver, a short spur trail leads to the Castle River Cabin. Castle River provides excellent opportunities for steelhead and coho salmon fishing.