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Harveys Lake (also known as Harvey Lake or Harvey's Lake) is a natural lake in Luzerne County, Pennsylvania, in the United States. It has a surface area of approximately 621.5 acres, or nearly a square mile. The lake is situated entirely within the borough of Harveys Lake.〔 By volume, it is the largest natural lake in Pennsylvania and by surface area, it is the second-largest. It is a glacial lake surrounded by hills and is the source of Harveys Creek, a tributary of the Susquehanna River. The lake has a stone masonry dam. The lake's watershed has an area of approximately 3600 acres. The majority of the watershed is forested, but there is some developed land as well. Nearly all of the developed land is close to the lake itself. The lake is surrounded entirely by a paved road. Harveys Lake was affected by algae blooms from the mid-20th century onward. These algae blooms were caused by pollution by nutrients, especially phosphorus. The lake was identified as impaired in 1994, with an annual phosphorus load of . However, the phosphorus load has been reduced somewhat since then. The lake is listed on the Luzerne County Natural Areas Inventory. A number of rare or endangered plant species have been observed in its vicinity. Various species of fish inhabit the lake and a number of bird species have been observed in its vicinity. Harveys Lake was accidentally discovered by Benjamin Harvey in 1781. The first settlers arrived at the lake in the 1790s and 1800s. Early industries in the area included lumbering and farming, but it became well known as a summer resort in the latter part of the 1800s and into the 1900s. It was also used as a water supply in the early 1900s. However, the lake began to develop significant environmental problems in the 1960s and a total maximum daily load was created for it in 1994. Since 1968, the lake has been located in the borough of Harveys Lake. ==Geography== Harveys Lake is the largest natural lake in Pennsylvania by volume and the second-largest by surface area.〔 It has a surface area of 621.5 acres and an average depth of 36 feet (11 meters).〔 Its maximum depth is .〔 The lake's shoreline is long. By surface area, it was approximately twice its current size when it was first surveyed in the late 1700s.〔 Harveys Lake is situated in the borough of Harveys Lake.〔 It is northwest of the city of Wilkes-Barre.〔 Harveys Lake is of glacial origin. It is surrounded by steep hills on all sides. At their highest point, to the south of the lake, they reach above the lake's elevation.〔 The lake has a gravel bottom.〔 The main outflow of Harveys Lake is Harveys Creek, a tributary of the Susquehanna River.〔〔 The lake's major inlets include two unnamed streams with widths between and depths of . Springs also feed into it.〔 The lake's elevation is above sea level.〔 The lake is located in north-central Luzerne County, in the Lower North Branch Susquehanna drainage basin and the Upper Susquehanna - Lackawanna basin. A 1921 book described the shape of Harveys Lake as "very irregular". The lake has a maximum length of and a maximum width of . It has a capacity of . Harveys Lake is dammed by a stone masonry dam with two spillways. The dam is long and high.〔 Harveys Lake was described as "one of the most beautiful" lakes in Pennsylvania in Henry C. Bradsby's 1893 book ''History of Luzerne County, Pennsylvania''. 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「Harveys Lake (Pennsylvania)」の詳細全文を読む スポンサード リンク
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