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The Dolores River is a tributary of the Colorado River, approximately long,〔(【引用サイトリンク】title=USGS National Atlas Streamer )〕 in the U.S. states of Colorado and Utah. The river drains a rugged and arid region of the Colorado Plateau west of the San Juan Mountains. Its name derives from the Spanish ''El Rio de Nuestra Señora de Dolores'', River of Our Lady of Sorrows. The river was explored and possibly named by Juan Maria Antonio Rivera during an 1765 expedition from Santa Fe. The mean annual flow of the Dolores prior to damming was approximately , but due to diversions it has been reduced to about . ==Course== The Dolores River rises in a meadow called Tin Can Basin, near Hermosa Peak〔http://peakery.com/hermosa-peak-colorado/〕 in the San Miguel Mountains, in Dolores County, Colorado. The headwaters are located about south of Lizard Head Pass in the San Juan National Forest. The river flows southwest in a canyon past Rico, receiving the West Dolores River, then flows into McPhee Reservoir near Dolores in Montezuma County. Formed by McPhee Dam, the reservoir is about long and diverts flows of the upper Dolores River for irrigation. Downstream from McPhee Dam, the river re-enters Dolores County and carves the Dolores River Canyon, which stretches north for over and averages deep.〔http://www.blm.gov/co/st/en/BLM_Programs/national_landscape/wilderness_study_areas/dolores_river_canyon.html〕 This section of the Dolores River is noted for its exposed sedimentary strata, desert wildlife, and during years of heavy snowmelt for its whitewater.〔http://www.canyoncountrywilderness.org/doloresriver.htm〕 Near Egnar the river crosses into San Miguel County and then from there into Montrose County.〔 Continuing north, the Dolores cuts ''across'' the Paradox Valley which runs in an unusual transverse direction to the river. Immediately below Paradox Valley it is joined by the San Miguel River, its main tributary, from the east.〔 (Incidentally, the Dolores and San Miguel have their headwaters to either side of Lizard Head Pass.)〔 Due to diversions on the main stem, the San Miguel is typically the same size as the Dolores if not larger, providing most of the flow below the confluence in dry years.〔http://www.blm.gov/co/st/en/fo/ufo/recreation/dolores_river_information.html〕〔http://www.americanwhitewater.org/content/River/detail/id/388/〕 Below the confluence with the San Miguel, the Dolores enters Mesa County, flowing north-northwest past Gateway and then turning west into Utah. The last segment of the river, entirely within Grand County, joins the Colorado near the historic Dewey Bridge, about above Moab.〔 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「Dolores River」の詳細全文を読む スポンサード リンク
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