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Ross Island is the main island of a four-island cluster in the Willamette River in Portland, Oregon, in the United States. The islands, covering a total of about , are owned mainly by Ross Island Sand and Gravel (RISG), which mined them extensively between 1926 and 2001.〔 The other three islands are Hardtack, East, and Toe. Ross Island was named for Oregon pioneer Sherry Ross. The islands split the Willamette River into Holgate Slough on the east.〔(【引用サイトリンク】 Ross Island: Questions and Answers About the Ross Island Assessment Project )〕 They are about south of downtown Portland at river mile 15,〔 the islands are slightly upriver (south) of the Ross Island Bridge between the Springwater Corridor Trail on the eastern shore and the South Waterfront on the western shore and slightly downriver from the Oaks Bottom Wildlife Refuge on the eastern shore and Willamette Park on the western shore. Ross is the longest of the islands, the closest to the western shore, and the closest to the Ross Island Bridge. Hardtack is to its east. East Island lies southeast of Hardtack, and Toe Island lies southwest of Ross. No bridge reaches the islands, which are approached only by boat. Ross Island is connected to Hardtack Island by an artificial levee built in 1926 by the U.S. Army Corps of Engineers in order to form a lagoon between the two islands. The lagoon made dredging easier for RISG and diverted water west of the islands, where it deepened a shipping channel.〔 In 2007, the owner of RISG, Robert B. Pamplin, Jr., donated of the island to the city of Portland, which plans to manage the property as a natural area.〔 〕 The islands, which retain remnants of forested riparian zones, are used by at least 50 species of birds including ospreys, eagles, herons.〔 The gift was accepted long after transfer negotiations stalled in 2002 over questions of liability for the islands' restoration and cleanup. Because it contains toxic fill dirt, the Ross-Hardtack lagoon is listed for cleanup by the Oregon Department of Environmental Quality. City staff and outside experts who inspected the in 2007 approved of their condition.〔 In addition to the gifted acres and the still owned by RISG, the Port of Portland owns . Conservationists have expressed hope that the Port will donate its land to the city and that Pamplin and city officials will agree on a long-term plan for the islands.〔 ==References== 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「Ross Island (Oregon)」の詳細全文を読む スポンサード リンク
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