Gressare Zuafliss van Willamette san: da McKenzie River (km 282, r), Long Tom River (km 240, l), Marys River (km 212, l), Calapooia River (km 190, r), Santiam River (km 174, r), Luckiamute River (km 174, l), Yamhill River (km 89, l), Molalla River (km 58, r), Tualatin River (km 45, l) sowia da Clackamas River (km 40, r).