3,117 acres of marsh, open-water, mudflats, and riparian/shrub habitat. Riparian woodland habitat along south and east sides of the reservoir are good for passerines in spring and summer. The walking trail in the southeastern part of the refuge is good for songbirds and some water birds, especially in spring and early summer. Umatilla County rarities, like Least Flycatcher, red-eyed Vireo, white-faced lbis, occasionally occur. As the reservoir recedes in late August, mud flats attract migrating shorebirds. A scope is needed for viewing the shorebirds. Least, Western, Baird's, Pectoral Sandpipers, both Yellowlegs, and Semipalmated Plover are common visitors in the fall, but less common, are Black-bellied and American-Plover, Stilt Sandpiper, and Marbled Godwit, (very rare in Umatilla County). Hundreds of American White Pelicans, Canada Geese, gulls, ducks, and grebes feed and rest on the reservoir.