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Green Lake is a freshwater lake in north central Seattle, Washington, within Green Lake Park. The park is surrounded by the Green Lake neighborhood to the north and east, the Wallingford neighborhood to the south, the Phinney Ridge neighborhood to the west, and Woodland Park to the southwest. It is a glacial lake, its basin having been dug 50,000 years ago by the Vashon glacier, which also created Lake Washington, Union, Bitter and Haller Lakes. ==History== Green Lake was named by David Phillips, who surveyed the area in September 1855 for the United States Surveyor General. His first notes referred to it as "Lake Green" because even in its natural state the lake is prone to algae blooms. The Duwamish called it ''dxWTLusH'', a Lushootseed word of unknown meaning. The lake has a surface area of , a mean depth of 13 feet (3.8 m), and a maximum depth of 30 feet (9.1 m). The lake has been dredged in order to maintain its depth. Green Lake lacks both surface water inflows and outflows. It once drained into Lake Washington via Ravenna Creek, but in 1911 the water level was lowered by 7 feet (2.1 m) to create parkland, causing the creek to dry up between Green Lake and Cowen Park. Ravenna Boulevard and its wide, grassy median were constructed over the creek bed. The lake is now fed by rainfall, storm runoff, and Seattle's municipal water supply. The area was originally homesteaded by various pioneers, the first being Erhart Sarfried, "Green Lake John." Sarfried subdivided his homestead in 1888 and sold the land to various entrepreneurs. W.D. Wood built an "amusement park" on the west side of the lake (which never amounted to more than a glorified lawn for picnics). On the east side of the lake, A.L. Parker logged the woods and built a sawmill. Edward C. Kilbourne built the first trolley line connecting the area to the city, the route of which is now Green Lake Way North. The trolley lines kept growing, until by 1910 they extended completely around the lake and a round trip could be made on a separate line going back to the city. In July 2008, several metal spikes up to in length were found along the bottom of the lake, injuring one person who accidentally stepped on them.〔("More spikes found in Green Lake." ) ''The Seattle Times''. July 18, 2008. Retrieved on August 7, 2008.〕 The Seattle Parks Department later confirmed that the spikes were from a forgotten pilot program to control the growth of Eurasian water milfoil in Green Lake. The invasive aquatic plant had first appeared in the lake in the early 1980s. In 1984, the Parks Department installed of black plastic sheeting along the bottom of the lake, using the spikes to hold the sheeting in place. The spikes originally had curved tips to prevent injury, but the tips had corroded and broken off. The city paid a team of divers to remove the remaining spikes in late July 2008.〔("Parks Dept. confirms Green Lake spikes leftover from its milfoil-control program." ) ''The Seattle Times''. July 29, 2008. Retrieved on August 7, 2008.〕 Throughout the course of the investigation, it was revealed that the city had also tried combating the milfoil with weed-eating fish, but hadn't made any serious efforts in the past 15 years aside from occasionally paying divers to pull the weeds by hand. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Green Lake (Seattle)」の詳細全文を読む スポンサード リンク
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