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Grassy Island Creek
Grassy Island Creek is a tributary of the Lackawanna River in Lackawanna County, Pennsylvania, in the United States. It is approximately long and flows through Jefferson Township and Jessup. The watershed of the creek has an area of . The lower reaches of the creek are impaired, but the upper reaches are not impaired. It is an intermittent stream during the summer, but its flow has been recorded as being as high as 116,553.21 gallons per minute. Some manganese, acidity, and alkalinity is also in the creek. It is in the Appalachian Mountain section of the ridge and valley pysiographic province. The main rock formations in the creek's watershed are made of sandstone and interbedded sedimentary rocks. Some reservoirs are in the watershed at the boundary between the Pocono Formation and the Llewellyn Formation.
The watershed of Grassy Island Creek is mainly forested, but there are also residential lands and abandoned mine lands. The creek is a source of flooding in Jessup. The remains of collieries such as the Sterrick Creek Colliery, the Mount Jessup Colliery, and the Pompey Colliery also occur in its vicinity. In 1996, the creek's channel failed, causing it to wash more than 30,000 cubic yards of culm into the Lackawanna River. In the 2000s, various channel repair efforts were carried out. A proposed natural gas-fired power plant intends to dump waste water into the creek.
==Course==
Grassy Island Creek begins on a mountain in Jefferson Township. It flows southwest for several tenths of a mile, until it reaches a valley. In the valley, the creek turns northwest for more than a mile, receiving two unnamed tributaries from the left and entering Jessup. In Jessup, it turns south-southwest for a few tenths of a mile and enters the Olyphant Reservoir Number Two, where it receives an unnamed tributary from the right. From the southern side of the reservoir, the creek turns west-southwest for a short distance, receiving an unnamed tributary from the left and entering the Olyphant Reservoir Number One. From this reservoir, the creek flows northwest for several tenths of a mile, receiving an unnamed tributary from the left. It eventually turns west and crosses US Route 6. Soon afterwards, it leaves the valley and turns north. Several tenths of a mile further downstream, the creek reaches its confluence with the Lackawanna River.〔
Grassy Island Creek joins the Lackawanna River upriver of its mouth.
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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