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:''For other uses, see Russian River (disambiguation).'' The Russian River, a southward-flowing river, drains 〔 of Sonoma and Mendocino counties in Northern California. With an annual average discharge of approximately , it is the second-largest river (after the Sacramento River) flowing through the nine-county Greater San Francisco Bay Area, with a mainstem 110 miles (177 km.) long. ==Course== The Russian River springs from the Laughlin Range about east of Willits in Mendocino County. It flows generally southward to Redwood Valley, then past Calpella, where it is bordered by U.S. Route 101, to join the East Fork Russian River just below Lake Mendocino. From there the Russian River flows south, past Ukiah and Hopland, and crosses into Sonoma County just north of Cloverdale. Closely paralleled by U.S. Route 101, it descends into the Alexander Valley, where it is joined by Big Sulphur Creek. It flows south past Cloverdale, Asti, and Geyserville. East of Healdsburg, Maacama Creek joins the Russian River. After it makes a series of sweeping bends, the Healdsburg Memorial Bridge carries Old Redwood Highway over the river just upstream of U.S. Route 101's Healdsburg crossing. It receives water from Lake Sonoma via Dry Creek. The river turns westward, where it is spanned by the Wohler Bridge, and it joins Mark West Creek north of Forestville, followed by Green Valley Creek to the south. The river passes Rio Nido and Guerneville. In that area, State Route 116 parallels the river, bordering it past Guernewood Park and Monte Rio. Austin Creek enters from the north before the River passes through Duncans Mills. State Route 1 crosses over the river before it flows into the Pacific Ocean between Jenner and Goat Rock Beach. The Russian River estuary is recognized for protection by the California Bays and Estuaries Policy.〔State Water Resources Control Board ''Water Quality Control Policy for the Enclosed Bays and Estuaries of California'' (1974) State of California〕 The mouth is about north of the San Francisco Bay's Golden Gate bridge. The lower Russian River is a popular spring, summer, and fall destination for navigation and recreation. It is very safe at that time for swimming and boating, with a gentle current.〔State of California ''Water Quality Control Plan North Coastal Basin 1B'' July 1975 p.13〕 The river is dangerous in the winter, with swift current and muddy water. 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「Russian River (California)」の詳細全文を読む スポンサード リンク
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