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Lake Swannanoa is a residential lake community located within Jefferson Township, in Morris County, New Jersey, United States. It is within the scenic Skylands Region and approximately by road from New York City. ==Geology and hydrology== The lake has two main sections, connected by a strait. The lake is an impoundment of Russia Brook,〔(USGS )〕 a tributary of the Rockaway River. There are also two ponds. There is an island in the north lake called Snake Island. A smaller island, Turtle Island, is indistinguishable from the shoreline at this time. The lake has two man-made dams, one for each section of the lake. The south dam has a spillway and valve, the north dam has a large valve and overflow spillway. The dams were both rehabilitated in 1998 from the original Ringling-era fieldstone and concrete construction. The south dam was upgraded in 2013 to meet (NJDEP Dam Safety & Flood Control ) requirements. This was as a direct result of an unusual meteorological event, the (August 2000 storm ). This storm arrived and did not move for over a day, dumping 14 inches (official measurement, independent estimates say 16+ inches) of rain to a restricted area. The resultant flooding caused the main thoroughfare Berkshire Valley Road to become inundated, but did not cause either dam to fail. Excessive overflow caused some undermining of the dam structure which has since been corrected. The lake was previously under orders of the New Jersey Department of Environmental Protection (NJDEP) to maintain a water level of no greater than two and no less than three feet below spillway until the repair was completed. Due to the large watershed, the lake both enjoys and is cursed with a high flow-through rate. The water in the lake is replaced approximately every 30–45 days. This allows for water refreshment, but makes aquatic weed treatment more challenging. 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「Lake Swannanoa, New Jersey」の詳細全文を読む スポンサード リンク
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