This IBA includes all land within the St. Croix National Scenic Riverway, Wild River State Park, and Lion's Park.
This IBA supports an exceptional diversity of bird species. More than 201 have been recorded, including Trumpeter swans, geese, ducks, pheasants, grouse, turkeys, hawks, owls, Bald eagles, osprey, cuckoos, woodpeckers, buntings, nuthatches, thrushes, 28 species of neotropical warblers, flycatchers, vireos, sparrows, Indigo buntings, and ravens. At least 130 of these have the potential to breed here.
This site recorded 25 records of Red-shouldered hawks and represents the largest lowland concentration of Red-shouldered hawks in Minnesota. Pairs of Louisiana waterthrush can be found along every significant flowage, and significant numbers of wintering Trumpeter swans use this IBA.