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〕 | length_imperial = 57 | length_round = 0 | length_note = | watershed_imperial = 508 | watershed_round = 0 | watershed_note = | discharge_location = near Dodge Park, from mouth | discharge_round = 0 | discharge_imperial = 2300 | discharge_note = 〔Average discharge rate was calculated by adding average annual discharge rates for 10 calendar years, 1994–2003, from USGS records and dividing by 10.〕 | discharge_min_imperial = 45 | discharge_max_imperial = 84400 | discharge1_location = | discharge1_imperial = | discharge1_note = | map = | map_size = | map_caption = | map1 = Oregon Locator Map.PNG | map1_size = 300 | map1_caption = Location of the mouth of the Sandy River in Oregon | map1_locator = Oregon | commons = }} The Sandy River is a tributary of the Columbia River in northwestern Oregon in the United States. The Sandy joins the Columbia about upstream of Portland. ==Course== Issuing from Reid Glacier on the southwest flanks of Mount Hood in the Cascade Range, the Sandy River flows generally west and then north for through Clackamas County and Multnomah County to the Columbia River at Troutdale.〔The nearby Sandy Glacier drains into Muddy Fork, a tributary of the Sandy River, rather than directly into the main stem.〕 In its first , the Sandy River flows across Old Maid Flat, north of Zigzag Mountain in the Mount Hood Wilderness of the Mount Hood National Forest. In this initial stretch near the headwaters, it receives Rushing Water Creek from the left, Muddy Fork from the right, then Lost Creek and Horseshoe Creek from the left, and crosses under Lolo Pass Road just before receiving Clear Creek from the right. At about from the mouth, the Zigzag River enters from the left near the unincorporated community of Zigzag. From here the river runs roughly parallel to U.S. Route 26, which is on its left for about the next . Just below Zigzag, the Sandy River passes the unincorporated community of Wemme on the left.〔(【引用サイトリンク】 publisher = TopoQuest )〕 At about from the mouth, the river receives Hackett Creek from the right, passes the unincorporated community of Brightwood shortly thereafter, and receives North Boulder Creek from the right. Barlow Trail County Park and remnants of the Barlow Road lie to the right along this stretch of the river. Between and from the mouth, the Salmon River enters from the left. Roughly later, Wildcat Creek enters from the left and then Alder Creek and Whiskey Creek, also from the left. The river passes the Marmot gauging station operated by the United States Geological Survey (USGS) in cooperation with Portland General Electric at river mile (RM) 29.8 (river kilometer (RK) 48.0). The unincorporated community of Marmot lies to the right of the river on a ridge—the Devil's Backbone—separating the Sandy River from the Little Sandy River to the north.〔〔 About below the Marmot gauge, the river receives Badger Creek from the left. It passes under Ten Eyck Road about from the mouth, flowing by the city of Sandy on the left, shortly thereafter and receiving Cedar Creek, home of the Sandy Fish Hatchery, from the left. At about from the mouth, the river turns away from Highway 26 and flows generally north-northwest for the rest of its course. About further downstream, the river passes Dodge Park on the right, receives the Bull Run River from the right and passes a second USGS gauge at RM 18.4 (RK 29.6). Shortly thereafter, Walker Creek enters from the right. Between and from the mouth, the Sandy River enters Multnomah County, curves back into Clackamas County, and re-enters Multnomah County. About further downstream, Bear Creek enters from the left, and the river flows around Indian John Island.〔〔〔 Soon Trout Creek, Gordon Creek, and Buck Creek all enter from the right as the river winds through Oxbow Regional Park between and from the mouth. Passing Camp Collins about later, the river receives Big Creek from the right. Dabney State Recreation Area is on the right about later. Lewis and Clark State Recreation Site is on the right and Troutdale on the left at about from the mouth, where Beaver Creek enters from the left. Shortly thereafter, the river passes under Interstate 84 and flows by Portland-Troutdale Airport, which is on the left about from the mouth. The Sandy River then joins the Columbia River about from where the larger river enters the Pacific Ocean. The confluence is about east of Portland, near the lower end of the Columbia River Gorge.〔〔 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「Sandy River (Oregon)」の詳細全文を読む スポンサード リンク
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