Montlake Fill (Union Bay Natural Area)

The Montlake Fill, officially known as the Union Bay Natural Area, is a 74-acre restored wetland and grassland on the University of Washington campus that has become one of Seattle's most accessible and productive birding spots. Over 200 species have been recorded on this former landfill site where restored native habitat now borders the shores of Union Bay on Lake Washington.

The flat, easy trails wind through cattail marsh, willow thickets, and open grassland where Savannah Sparrows, Northern Harriers, and occasional Short-eared Owls hunt in winter. The lakeshore attracts a variety of ducks, grebes, and herons year-round, while spring and fall migration bring warblers, flycatchers, and shorebirds. The site is beloved by Seattle birders for its combination of convenience, diversity, and the ongoing story of habitat restoration.