Guild's Lake (also Guild Lake) was a flood-prone lowland near the confluence of Balch Creek with the Willamette River in the U.S. state of Oregon. Indigenous Multnomah people established villages on nearby Sauvie Island but not in the swampy area along the Balch Creek side of the river in what later became northwest Portland. The lake was at an elevation of 33 feet (10 m) above sea level between what later became Northwest Saint Helens Road and Northwest Yeon Street, slightly west of Northwest 35th Avenue in the Northwest Industrial district of Portland.