The tabletop-like surface of Camas Prairie Centennial Marsh is illustrated by the two-foot elevation drop from the WMA's western edge to its opposite border two miles east. And though the entire area is a portion of the Camas Creek floodplain, only at the northeast corner of the property is evidence of a visible creek bed discernable. Snowmelt and other runoff water flow slowly over Centennial Marsh, only to be neatly channeled into Camas Creek where it exits the WMA.
Camas Creek is filled bank to bank from April through June and is dry by mid-July. During this time, thousands of waterfowl (Mallard, Northern Pintail, Canvasback, Gadwall, Cinnamon Teal, Green-winged Teal, and Blue-winged Teal), shorebirds (Long-billed Curlew, Willet, Black-necked Stilt, American Avocet, Wilson's Snipe, Wilson's Phalarope), and other waterbirds (Eared Grebe, Sora, Sandhill Crane*, Ring-billed Gull, California Gull) use the area.
Drought is a serious problem at this site. Water levels are much lower than historically, and the entire site dries up earlier than historically. Brood-rearing ponds are supplied by wells, but exploring additional methods of restoring water levels at this site is recommended. Introduced plants/animals are a problem, as is predation. There is an on-going predator trapping program.
Seasonally high water levels result in a habitat setting unique to the intermountain area. Centennial Marsh is comprised primarily of sedges, juncos, and camas, while water loving Silver sagebrush neatly delineates the marshes high water line. The Camas Lily is used by Bannock, Shoshoni, and Northern Paiute tribes as an important food resource. Upland areas of Camas Prairie are comprised of big sagebrush, rabbitbrush, bitterbrush, and Great Basin wildrye.