Mesa Marsh is a large marsh surrounded by lodgepole pine and natural meadows. An island in the center of the marsh holds decadent aspen, which have provided nesting habitat for Great Blue Herons, Bald Eagles, and Osprey.
A diverse array of breeding waterfowl (Trumpeter Swan, Canada Goose, Northern Pintail, Blue-winged Teal, Cinnamon Teal, American Wigeon, Northern Shoveler, Ring-necked Duck, Common Merganser, Ruddy Duck), waterbirds (Sandhill Crane, Eared Grebe, Sora) and Bald Eagles can be found at this site. Common Loons, American Avocets, and Wilson?s Phalaropes can be found during migration.
In extreme dry years, grazing may have a negative impact on marsh vegetation, and increase disturbance to birds; however grazing does help keep the vegetation vigorous. Past timber harvest has impacted tree nesting habitat and wildlife security around the marsh. Waterfowl hunting occurs while there are sensitive species using the marsh. To cut down on wildlife disturbance, access roads leading into the marsh have been closed and the location of the marsh is not advertised nor promoted.
This site is located in one of the largest volcanic craters in the world. Beaver have dammed the outlet resulting in increased depth in the marsh. Lodgepole pine forest surrounds the marsh and nearby meadows along with some sagebrush.