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The Patapsco River is a 〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed April 1, 2011〕 river in central Maryland which flows into the Chesapeake Bay. The river's tidal portion forms the harbor for the city of Baltimore. With its South Branch, the Patapsco forms the northern border of Howard County, Maryland. The name "Patapsco" is derived from the Algonquian ''pota-psk-ut'', which translates to "backwater" or "tide covered with froth."〔(【引用サイトリンク】title=Ghosts of industrial heyday still haunt Baltimore’s harbor, creeks )〕 ==Geography== The Patapsco proper begins at the confluence of the North and South Branches, near Marriottsville, approximately west of downtown Baltimore. The 〔 South Branch rises further west at Parrs Spring, where Howard County, Carroll, Frederick, and Montgomery counties meet. The North Branch flows 〔 southward from its origins in Carroll County. Through most of its length, the Patapsco is a minor river, flowing for the most part through a narrow valley. The last , however, form a large tidal estuary inlet of Chesapeake Bay. The inner part of this estuary provides the harbor of Baltimore, composed of the Northwest Harbor and the Middle Branch including Thoms Cove. (See Baltimore Inner Harbor.) The Patapsco estuary is south of the Back River and north of the Magothy River. The Patapsco has a watershed area (including the water surface) of , or of land. Thus, its total watershed area is 7% water. Patapsco Valley State Park is adjacent to of the Patapsco and its branches, encompassing a total of in five different areas. The river cuts a gorge 100–200 feet (35–70 m) deep within the park, which features rocky cliffs and tributary waterfalls. Liberty Dam and its reservoir, located on the North Branch, is a major component of the Baltimore city water system.〔Baltimore County Department of Environmental Protection and Resource Management. Towson, MD. ("Patapsco River Watershed." ) 2009-07-13.〕 Besides Baltimore, the river also flows through Ellicott City (the county seat of Howard County) and Elkridge. 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「Patapsco River」の詳細全文を読む スポンサード リンク
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