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The Eastern Cascades Slopes and Foothills ecoregion is a Level III ecoregion designated by the United States Environmental Protection Agency (EPA) in the U.S. states of Oregon, Washington, and California. In the rain shadow of the Cascade Range, the eastern side of the mountains experiences greater temperature extremes and receives less precipitation than the west side. Open forests of ponderosa pine and some lodgepole pine distinguish this region from the Cascades ecoregion, where hemlock and fir forests are more common, and from the lower, drier ecoregions to the east, where shrubs and grasslands are predominant. The vegetation is adapted to the prevailing dry, continental climate and frequent wildfire. Volcanic cones and buttes are common in much of the region.
Oregon Route 242, known as a portion of the McKenzie Highway, is an Oregon state highway that runs from Belknap Springs, Oregon through McKenzie Pass in the Oregon Cascades, to Sisters, Oregon, in the United States. The McKenzie Highway was added to the National Register of Historic Places in February, 2011.
NRHP reference number: 10001215
Clark Glacier is in the U.S. state of Oregon. The glacier is situated in the Cascade Range at an elevation around 9,000 feet (2,700 m). Clark Glacier is just to the southwest of South Sister, a dormant stratovolcano.
USGS GNIS ID: 1139756
Mount Multnomah is an invalidated hypothetical ancient volcano postulated in a 1925 publication by geologist Edwin T. Hodge. It was proposed to exist in central Oregon at the present day location of the Three Sisters region. It was estimated to have been around 16,000-foot (4,900 m) tall, and was believed destroyed in a fashion similar to Mount Mazama's eruption resulting in what is now Crater Lake in southern Oregon.
The Milli Fire was a wildfire that burned over 24,000 acres (97 km2) of Oregon forest land during the summer of 2017. The fire began in the Deschutes National Forest on 11 August 2017, the result of a lightning strike. The fire consumed thick forest vegetation southwest of Sisters, Oregon. Most of the burned area was public lands administered by the United States Forest Service, much of it in the Three Sisters Wilderness. Firefighters battled the blaze for over a month. At the peak of the firefighting effort, there were 675 firefighters working on the Milli Fire.
The Nash Fire is a wildfire that occurred in the Deschutes National Forest and Willamette National Forest, on the southwest slope of the South Sister Mountain in Oregon in the United States. The fire, which was started by lightning, started on August 10, 2017. The Nash Fire was part of the Horse Creek Complex but for reporting purposes was removed from the complex by authorities. The fire threatened the campgrounds and structures at Elk Lake, Hosmer Lake, Lava Lake, and Little Lava Lake.