March 9, 2013: Snow Geese Annual Migration - Fort Boise Wildlife Management Area Fort Boise is at the confluence of the Snake, Boise, and Owyhee Rivers. Cottonwoods and willows line the waterways, with wetlands and artificial impoundments surrounded by cattail, bulrush, and sedges. Idaho’s most dependable location for thousands of Snow and Greater White-fronted Geese.