Tryon Creek
http://dbpedia.org/resource/Tryon_Creek an entity of type: Thing
特赖恩河（英語：Tryon Creek）位於美国俄勒冈州，全長7.81公里，流域面積17平方公里，是威拉米特河的支流。河流自波特蘭的圖拉丁山脈內流出，大致往東南方向流動，最後與萊克奧斯韋戈市內的威拉米特河交匯。流域有超過7成的土地屬於住宅用地，其次是公園和露天場所用地。特賴恩河州立自然保護區是流域內最大的公園，範圍橫跨姆尔特诺默县和克拉克默斯縣。 流域下方的基岩是北美洲板塊在始新世期間所合併的最後一塊外來地塊。該地塊的最東面有一塊露出的玄武岩地層，它構成了特賴恩河州立自然保護區大部分地區的基礎。韋弗利山地層是區內另一塊地層，但被火山灰、岩漿、沉積物和淤泥層掩埋。博林火山區內的兩座睡火山亦佇立在流域內。 河流名稱源於19世紀中葉的拓荒者老蘇格拉底·霍奇克斯·特賴恩。在以前，河流一度流經由雪松和冷杉組成的原始森林。但在往後一世紀，俄勒岡鋼鐵公司及多間伐木公司接連砍伐區內森林，導致森林面積不斷縮小。20世紀中葉，在政府、非營利組織和公民的齊心協力下，最終成功設立特賴恩河州立自然保護區。現時流域約有37%的土地被森林覆蓋，孕育逾60種鳥類以及不同魚類、哺乳動物和兩棲動物。由於河流的細菌、總懸浮固體和養分含量過高，加上水溫超出適合魚類棲息的上限，河流水質仍有待改善。
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Tryon Creek is a 4.85-mile (7.81 km) tributary of the Willamette River in the U.S. state of Oregon. Part of the drainage basin of the Columbia River, its watershed covers about 6.5 square miles (16.8 km2) in Multnomah and Clackamas counties. The stream flows southeast from the Tualatin Mountains (West Hills) through the Multnomah Village neighborhood of Portland and the Tryon Creek State Natural Area to the Willamette in the city of Lake Oswego. Parks and open spaces cover about 21 percent of the watershed, while single-family homes dominate most of the remainder. The largest of the parks is the state natural area, which straddles the border between the two cities and counties.
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Tryon Creek
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特赖恩河
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Tryon Creek
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Tryon Creek
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Upper Tryon Creek in Marshall Park
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300
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Tryon Creek watershed
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USA Oregon
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Location of the mouth of Tryon Creek in Oregon
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Multnomah and Clackamas
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Country
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State
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County
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45.44694444444445 -122.72166666666666
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Tryon Creek is a 4.85-mile (7.81 km) tributary of the Willamette River in the U.S. state of Oregon. Part of the drainage basin of the Columbia River, its watershed covers about 6.5 square miles (16.8 km2) in Multnomah and Clackamas counties. The stream flows southeast from the Tualatin Mountains (West Hills) through the Multnomah Village neighborhood of Portland and the Tryon Creek State Natural Area to the Willamette in the city of Lake Oswego. Parks and open spaces cover about 21 percent of the watershed, while single-family homes dominate most of the remainder. The largest of the parks is the state natural area, which straddles the border between the two cities and counties. The bedrock under the watershed includes part of the last exotic terrane, a chain of seamounts, acquired by the North American Plate as it moved west during the Eocene. Known as the Waverly Hills Formation, it lies buried under ash and lava from later volcanic eruptions, sediments from flooding and erosion, and layers of wind-blown silt. Two dormant volcanoes from the Boring Lava Field are in the Tryon Creek watershed. Named for mid-19th century settler, Socrates Hotchkiss Tryon, Sr., the creek ran through forests of cedar and fir that were later logged by the Oregon Iron Company and others through the mid-20th century. Efforts to establish a large park in the watershed began in the 1950s and succeeded in 1975 when the state park was formally established. As of 2005, about 37 percent of the watershed was wooded and supported more than 60 species of birds as well as small mammals, amphibians, and fish. At the same time, the human population was about 18,000.
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特赖恩河（英語：Tryon Creek）位於美国俄勒冈州，全長7.81公里，流域面積17平方公里，是威拉米特河的支流。河流自波特蘭的圖拉丁山脈內流出，大致往東南方向流動，最後與萊克奧斯韋戈市內的威拉米特河交匯。流域有超過7成的土地屬於住宅用地，其次是公園和露天場所用地。特賴恩河州立自然保護區是流域內最大的公園，範圍橫跨姆尔特诺默县和克拉克默斯縣。 流域下方的基岩是北美洲板塊在始新世期間所合併的最後一塊外來地塊。該地塊的最東面有一塊露出的玄武岩地層，它構成了特賴恩河州立自然保護區大部分地區的基礎。韋弗利山地層是區內另一塊地層，但被火山灰、岩漿、沉積物和淤泥層掩埋。博林火山區內的兩座睡火山亦佇立在流域內。 河流名稱源於19世紀中葉的拓荒者老蘇格拉底·霍奇克斯·特賴恩。在以前，河流一度流經由雪松和冷杉組成的原始森林。但在往後一世紀，俄勒岡鋼鐵公司及多間伐木公司接連砍伐區內森林，導致森林面積不斷縮小。20世紀中葉，在政府、非營利組織和公民的齊心協力下，最終成功設立特賴恩河州立自然保護區。現時流域約有37%的土地被森林覆蓋，孕育逾60種鳥類以及不同魚類、哺乳動物和兩棲動物。由於河流的細菌、總懸浮固體和養分含量過高，加上水溫超出適合魚類棲息的上限，河流水質仍有待改善。
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below the confluence with Nettle Creek, from the Tryon Creek mouth
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Socrates Hotchkiss Tryon, Sr., who settled nearby in 1850
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