Proxy Falls, also known as Lower Proxy Falls, is a cascade and plunge waterfall from a collection of springs on the shoulder of North Sister, that plunges into a gaping canyon near McKenzie Pass in the Willamette National Forest, near Belknap Springs, Oregon. The waterfall is notable for its main drop of 226 feet which makes it one of the highest plunge wa…Proxy Falls, also known as Lower Proxy Falls, is a cascade and plunge waterfall from a collection of springs on the shoulder of North Sister, that plunges into a gaping canyon near McKenzie Pass in the Willamette National Forest, near Belknap Springs, Oregon. The waterfall is notable for its main drop of 226 feet which makes it one of the highest plunge waterfalls in Oregon.