Question: 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, the Three Sisters are a complex volcano of three volcanic peaks of the Cascade Volcanic Arc and the Cascade Range in which U.S. state?

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Mount Tehama: Mount Tehama (also called Brokeoff Volcano or Brokeoff Mountain) is an eroded andesitic stratovolcano in the Cascade Volcanic Arc and the Cascade Range in Northern California.  Part of the Lassen volcanic area, its highest remaining remnant, Brokeoff Mountain, is itself the second highest peak in Lassen Volcanic National Park and connects to the park's highest point, Lassen Peak.  Located on the border of Tehama County and Shasta County, Tehama's peak is the highest point in the former.  The hikers that summit this mountain each year are treated to "exceptional" views of Lassen Peak, the Central Valley of California, and many of the park's other features.  On clear days, Mount Shasta can also be seen in the distance.

Medicine Lake Volcano: Medicine Lake Volcano is a large shield volcano in northeastern California about 50 km northeast of Mount Shasta.  The volcano is located in a zone of east-west crustal extension east of the main axis of the Cascade Volcanic Arc and the Cascade Range.  The 1 km thick shield is 35 km from east to west and 45 to from north to south, and covers more than 2000 km2 .  The underlying rock has downwarped by 0.5 km under the center of the volcano.  The volcano is primarily composed of basalt and basaltic andesite lava flows, and has a 7 by caldera at the center.

Proxy Falls: 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 ft which makes it one of the highest plunge waterfall in Oregon.

Three Sisters (Oregon): The Three Sisters are a complex volcano of three volcanic peaks of the Cascade Volcanic Arc and the Cascade Range in the U.S. state of Oregon.  Each exceeding 10000 ft in elevation, they are the third-, fourth-, and fifth-highest peaks in the state of Oregon, and are located in the Three Sisters Wilderness, about 10 mi south of the nearest town of Sisters.  Diverse species of flora and fauna inhabit the area on and around the mountains, which is subject to frequent snowfall, occasional rain, and extreme temperature differences between seasons.  The mountains, particularly South Sister, are popular for climbing and scrambling.

Mount Baker: Mount Baker (Lummi: "Qwú’mə Kwəlshéːn "; Nooksack: "Kw’eq Smaenit" or "Kwelshán "), also known as Koma Kulshan or simply Kulshan, is an active glaciated andesitic stratovolcano in the Cascade Volcanic Arc and the North Cascades of Washington in the United States.  Mount Baker has the second-most thermally active crater in the Cascade Range after Mount Saint Helens.  About 31 mi due east of the city of Bellingham, Whatcom County, Mount Baker is the youngest volcano in the Mount Baker volcanic field.  While volcanism has persisted here for some 1.5 million years, the current glaciated cone is likely no more than 140,000 years old, and possibly no older than 80–90,000 years.  Older volcanic edifices have mostly eroded away due to glaciation.

Canadian Cascade Arc: The Canadian Cascade Arc, also called the Canadian Cascades, is the Canadian segment of the North American Cascade Volcanic Arc.  Located entirely within the Canadian province of British Columbia, it extends from the Cascade Mountains in the south to the Coast Mountains in the north.  Specifically, the southern end of the Canadian Cascades begin at the Canada–United States border.  However, the specific boundaries of the northern end are not precisely known and the geology in this part of the volcanic arc is poorly understood.  It is widely accepted by geologists that the Canadian Cascade Arc extends through the Pacific Ranges of the Coast Mountains.  However, others have expressed concern that the volcanic arc possibly extends further north into the Kitimat Ranges, another subdivision of the Coast Mountains, and even as far north as Haida Gwaii (formerly known as the Queen Charlotte Islands).

Yamsay Mountain: Yamsay Mountain is a large shield volcano in the Cascade Range of south-central Oregon, located about 35 mi east of Crater Lake on the border between Klamath County and Lake County.  It is part of the Cascade Volcanic Arc but is located in a mountain range 30 to behind the main Cascade volcanic front.  The best known members of this enigmatic arc are the massive shields of Newberry Volcano, about 55 mi farther north in Oregon, and Medicine Lake Volcano, about 80 mi south in Northern California.  Yamsay is the highest volcano in the eastern arc, almost 300 ft higher than Newberry and Medicine Lake.

Cascade Volcanoes: The Cascade Volcanoes (also known as the Cascade Volcanic Arc or the Cascade Arc) are a number of volcanoes in a volcanic arc in western North America, extending from southwestern British Columbia through Washington and Oregon to Northern California, a distance of well over 700 mi .  The arc has formed due to subduction along the Cascadia subduction zone.  Although taking its name from the Cascade Range, this term is a geologic grouping rather than a geographic one, and the Cascade Volcanoes extend north into the Coast Mountains, past the Fraser River which is the northward limit of the Cascade Range proper.

Mount McLoughlin: Mount McLoughlin is a steep-sided lava cone built on top of a composite volcano in the Cascade Range of southern Oregon and within the Sky Lakes Wilderness.  It is one of the volcanic peaks in the Cascade Volcanic Arc.  The mountain is north of Mount Shasta, south of Crater Lake, and west of Upper Klamath Lake.  It was named around 1838 after John McLoughlin, a Chief Factor for the Hudson's Bay Company.

Upper Chush Falls: Upper Chush Falls is a 200 ft waterfall on Whychus Creek, in the Cascade Range southwest of Sisters in the U.S. state of Oregon.  Chush Falls, a 50 ft waterfall, is further downstream on the same creek.  Lying between Chush and Upper Chush is a third waterfall, The Cascade.  These and several other falls on tributaries in the vicinity are within the Three Sisters Wilderness.  The Northwest Waterfall Survey lists the fall's average flow at 40 ft3/s .  The highest flows occur between May and August.

Supporting paragraphs: Proxy Falls Three Sisters (Oregon)
Answer: Oregon