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Frame Lake is located in Yellowknife, Northwest Territories, Canada. It is an endorheic〔 freshwater body located between the city's downtown section and a larger residential area. The Frame Lake Trail circles it, and city hall and the territorial legislative assembly building are on its shores. Formed by meltwater after the end of the Wisconsin glaciation 20,000 years ago, Frame has been an important part of Yellowknife's history. The Dene in the area used it as a fishing spot before European settlement. In the early years of the city's growth, gold mines nearby dumped tailings in it and sometimes sewage. Later, when the city's New Town, now its downtown section, was surveyed and developed nearby, Frame offered accessible swimming and boating opportunities. However, storm sewers diverted much of the runoff that fed it. Later development blocked the lake's only outflow, leaving it endorheic〔While the word "endorheic" has not been used to describe the lake, Woodall and Healey described it as having only seepage as its outflow, and later sources (such as Carleton) note that the 1970s construction of the causeway blocked the only outlet.〕 and complicating the problems caused by earlier pollution. By the early 1970s it no longer supported any fish; within two decades residents had stopped swimming or boating it out of fear of leeches. Subsequent studies have shown that the lake completely eutrophied sometime in the mid-1990s. They have not, however, been able to determine whether that was due to climate change, pollution or some combination of both; the possibility exists that the lake has always been at a higher trophic state than others in the area. Some city residents have agitated for efforts to reclaim the lake so it will once again be a destination for swimmers, anglers and boaters in warm weather. To do so, it will be necessary to reoxygenate the water to the point that fish can again inhabit its waters. This could be accomplished either by aeration or dredging, which would remove the accumulated rotted organic matter on the lake bed that currently renders it anoxic when the lake is frozen over in the winter. ==Geography== Frame Lake is irregularly shaped, with a northern section and a southern section along a north-northeast to south-southwest axis approximately long, connected by a narrower central passage midway along its length where a wide peninsula extends from the western shore and an arm extends roughly to the east, curving northward. At their widest shorelines, both sections are roughly the same distance apart. Five small islands are located within the lake, three in the northern section and two in the southern section.〔 Its total surface area is .〔 The lake lies at an elevation of . Surrounding terrain is gently undulating, with some of the small hills nearby cresting as high as and one of the islands rising to . Two unnamed streams drain into the lake south of the peninsula on the western side. The northerly of the two rises from drainage ditches surrounding the runways at Yellowknife Airport to the west, draining Robinson's Pond on the way to Frame Lake; the southerly has largely been channelized, draining Range Lake to the west, itself fed by a stream of similarly short length flowing into it from the west. Surrounding terrain, as well as that of the islands, is primarily taiga forest, amid mostly bare outcrops of Canadian Shield bedrock typical of the Yellowknife area. Bare rock predominates on the shoreline, except for some shallow bays with weed beds.〔 On the eastern shore, near the southern end of the lake, is an overgrown sandy area called McNiven Beach,〔 after the city's first mayor. The developed areas of Yellowknife form a "V" around the lake. On the eastern side, and the southern shore of the arm, is New Town, the city's modern downtown. Public buildings such as City Hall, the Royal Canadian Mounted Police's local headquarters, and the Canadian Forces Northern Area Headquarters Yellowknife are situated along the south side of the arm, their associated lawns coming almost to the edge of the lake. South of City Hall along the lake shore is Somba K'e Park, open space with the only totally developed portion of shoreline. Beyond it, the taiga and bedrock buffer the lake from the city, except for the dead end of residential Matonabee Road. The Frame Lake Trail, a partially paved pathway in length, closely follows the shoreline past an extensive area of forest. Just south of McNiven Beach is a recreational facility with an arena and pool, again close to the water's edge. At the south end, another residential neighborhood comes near the lake, after which a rocky area buffers Stanton Regional Hospital.〔 Commercial strip development along Old Airport Road also comes close, and the road itself runs alongside part of the lake's southwestern shore for . After it curves away to the west, the northwestern side and northern end of the lake are all taiga and bedrock between Frame and nearby Robinson's Pond and Jackfish Lake, with just the trail alongside.〔 Amid a park-like setting on the northeastern corner of the lake, and the northern shore of the western arm, stand two other large public buildings: the Prince of Wales Northern Heritage Centre and Northwest Territories Legislative Assembly Building. The two are connected via paths and driveways through the intervening taiga and bedrock. A causeway carries the Frame Lake Trail across the tip of the arm, where the Northern Frontier Visitor Centre overlooks the lake. 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「Frame Lake」の詳細全文を読む スポンサード リンク
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