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Greenleaf Peak

Cascade RangeColumbia River GorgeLandslides in the United StatesMountains of Skamania County, WashingtonMountains of Washington (state)
Greenleaf Peak 2372s
Greenleaf Peak 2372s

Greenleaf Peak is a mountain in the Cascade Range in the U.S. state of Washington, located on the north side of the Columbia River near Table Mountain, in the Columbia River Gorge. The peak lies within the Columbia River Gorge National Scenic Area near Bonneville Dam. It is 3,424 feet (1,044 m) in elevation. Botanist David Douglas climbed to the summit in September 1825, making this the first recorded mountain ascent in what is now Washington state. Just south of the summit of Greenleaf Peak there is a dramatic escarpment called Red Bluffs, which connects Greenleaf Peak and Table Mountain. Approximately 1,300 feet (400 m) of the Eagle Creek formation are exposed at Red Bluffs. The Red Bluffs escarpment was created by the repeated collapse of Greenleaf Peak and Table Mountain. Massive landslides have fallen from the mountains, creating a 12-to-14-square-mile (31 to 36 km2) area of debris called the Cascade Landslide Complex. The largest and most studied landslide is known as the Bonneville Slide, which created the Bridge of the Gods and Cascade Rapids The topography of the landslide complex is uneven with roughly rolling hills and abrupt slopes. The whole area is inclined south toward and beyond the Columbia River. There may have been a cinder cone between Greenleaf Peak and Table Mountain which collapsed during the Bonneville Slide. The propensity of the area south of Greenleaf Peak and Table Mountain to collapse in landslides is due to the Eagle Creek formation. The rocks of the formation cover approximately 30 miles (48 km) of the Columbia River Gorge east of Cape Horn and consist of a mixture of past landslides, volcanic mud flows and ash falls. The formation is topped with basalt. Water can percolate through the basalt and saturate the Eagle Creek formation. In places where the formation is relatively close to the surface and inclined downslope, such as near Greenleaf Peak and Table Mountain, water saturation can cause the formation's material to slide away, carrying the overlying basalt with it.Between Greenleaf Peak and Table Mountain, and above the Red Bluffs, lies Greenleaf Basin. The basin averages 2,040 feet (620 m) in elevation and is covered with forested wetlands. Greenleaf Creek flows south through the basin before plunging as a waterfall over the Red Bluffs escarpment. In the winter of 2007-2008, there was a large landslide on the south slope of Greenleaf Peak, in the state-owned Table Mountain Natural Resources Conservation Area. Some 3 to 5 acres (12,000 to 20,000 m2) of a timbered rocky cliff slid, burying approximately 30 acres (120,000 m2) of forest under rubble. The slide was estimated to be about 750 feet (230 m) wide and 0.5 miles (0.80 km) long.

Excerpt from the Wikipedia article Greenleaf Peak (License: CC BY-SA 3.0, Authors, Images).

Geographical coordinates (GPS)

Latitude Longitude
N 45.713974956 ° E -121.966995881 °
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Skamania County



Washington, United States
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Greenleaf Peak 2372s
Greenleaf Peak 2372s
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Fort Cascades
Fort Cascades

Fort Cascades was a United States Army fort constructed in 1855 to protect the portage road around the final section of the Cascades Rapids, known as the "lower cascades." It was built on the Washington side of the Columbia River, between the present site of North Bonneville and the Bonneville Dam in Skamania County. It was burned in 1856, then rebuilt, but abandoned in 1861. A small community, Cascades, formed around the fort, but the largest flood of the Columbia River in recorded history passed over both the townsite and the fort site in 1894. Cascades served as the county seat of Skamania County prior to 1893, when the county records were moved to Stevenson, In 1867, decades before the disastrous floods, famed photographer Carleton Eugene Watkins arrived on the scene. Watkins took a commission from the Oregon Steam Ship Navigation Company to document areas of the Columbia River, with "Cascades" featuring prominently in his Pacific Coast stereoviews collection. Approximately 50 Watkins stereoscopic images of the Cascades area are known to exist, ranging from serials 1250-1302. Labeled "Upper Cascades," "Cascades" and "Lower Cascades," these photographs feature river view landscapes as well as images of the town and fort blockhouses. Aside from capturing scenery, Watkins documents saw mills, as well as train and riverboat traffic vital to the local economy at that time. A few of the images provide a glimpse of salmon fishing before the rapids were submerged by the construction of the Bonneville Dam. Although his negatives were destroyed in the great 1906 San Francisco earthquake, many of his printed images can be found in museums and private collections around the world.Fort Cascades is now on the National Register of Historic Places. There is a self-guided tour through what remains of the fort and the townsite. The trail the tour follows is approximately 1.5 miles (2.4 km) long. There is also a replica of a rock covered with petroglyphs that was originally located at the site but has since been moved to Stevenson. Fort Cascades is one of several forts built to protect the portage around the Cascade Rapids. Others are Fort Raines and Fort Lugenbeel.