This IBA encompasses the Bibon Swamp State Natural Area. Bibon Swamp is the largest wetland in Bayfield County and one of the largest in the state. It occupies the basin of an extinct glacial lake where Eighteen-Mile Creek, Twenty-mile Creek, Long Lake Branch, and the White River merge. The site hosts an unusually varied array of wetland communities, considering its unvarying topography. White cedar swamp, tamarack/black spruce swamp, open bog, swamp hardwoods, extensive alder/willow thickets, and some sedge meadow all are found here. Uplands are rolling with loamy to red clay soils, and consist of managed young aspen, pine forest and hardwood forest.
The site is considered a swamp hardwood and alder/willow core, with up to 7,000 acres of habitat available. A variety of wetland birds breed here, including conifer bog, shrub swamp, and sedge meadow species. Priority species include Gray Jay, Boreal Chickadee, Golden-winged Warbler, and Canada Warbler. Alder Flycatcher, Veery, Nashville Warbler, and Northern Waterthrush are found in high numbers. This site is significant in the variety and quality of wetland habitats, and the full breeding assemblages of associated bird species that it supports.
The swamp hardwood and alder/willow core is embedded in 6,000 acres of land that is passively managed for white cedar swamp, swamp conifer, sedge meadow, and upland deciduous forest. This site presents an opportunity to maintain an extensive complex of native wetland communities. Managing the uplands for a diversity of size and age classes would benefit many of the priority species here; future property management planning may provide for this. It is important to maintain or restore natural hydrologic processes, protect wetlands from disturbance, sedimentation, and invasive species, and utilize sustainable forest management practices to preserve water quality.