Northwest Montana WMD includes 1 waterfowl production areas (WPAs) open to public hunting in the Flathead and Mission valleys. Ranging in size from 28 to 2,370 acres, these areas offer excellent waterfowl and upland bird hunting. The area is intermountain grassland thickly dotted with wetlands. These wetlands, created during the 100,000-year Wisconsin glaciation, are spread throughout the district. One WPA, known as Flathead, consists of seven miles of lake shoreline and upland along the northern end of Flathead Lake, including remnants of delta islands at the mouth of Flathead River. In the wetlands, hunters should encounter good numbers of ducks, including redhead, mallard, wigeon, green-winged and blue-winged teal, and shoveler. In the grasslands, upland bird hunters experience successful hunts for pheasant and gray partridge.