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Ripogenus Gorge
Ripogenus Gorge is a rock-walled canyon formed where the West Branch Penobscot River crosses the Caribou Lake anticline. Ripogenus Falls controlled discharge from Ripogenus Lake until Ripogenus Dam was completed at the upstream end of the gorge in 1916. The dam forms a hydroelectric reservoir raising the level of Ripogenus Lake to include the upstream Chesuncook Lake, Caribou Lake, and Moose Pond. The resulting reservoir is often identified by the name of the largest included lake: Chesuncook. The gorge provides an unusual exposure of Maine North Woods bedrock typically covered by saturated glacial till. The Silurian Ripogenus Formation of weakly metamorphosed shallow marine siliciclastics and fossiliferous limestone has been described from investigation of the gorge.〔(【引用サイトリンク】title=Silurian Ripogenus Formation )〕
==History==
Spruce forests along the west branch were harvested through the 19th century with logs floated through the gorge to sawmills as far downstream as Bangor, Maine. Log driving rivermen altered the gorge with dynamite and timber cribs filled with stone to prevent log jams. Construction of Ripogenus Dam began in 1915 to provide hydroelectricity for the paper mill at Millinocket, Maine. The dam is high and long and impounds the largest storage reservoir ever built with private funding. Hydroelectricity is generated by diverting through a mile-long penstock around the former falls. Pulpwood was sluiced over the dam until 1971 when Great Northern Paper Company began trucking the lumber to the mill via the Golden Road.〔(【引用サイトリンク】title=The Northern: The Way I Remember )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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