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Chino Creek
Chino Creek is a major stream of the Inland Empire in Southern California in the United States. Although the main stem is short at about , it drains an extensive basin of from the San Gabriel Mountains to the Santa Ana River near Corona. The creek's watershed spans three counties, with the majority in San Bernardino County, and parts of seven incorporated cities.
The drainage basin is intensely developed for residential, industrial and agricultural use. As a result, the creek and its tributaries are heavily polluted, and receive effluents from multiple wastewater treatment plants and drains. Agricultural pollution from the raising of livestock in the creek's lower basin is the largest source of contamination. There are efforts to control nuisance flows and pollutants in the lower part of the creek to protect the wetlands in the Prado Flood Control Basin, an important ecological area.
==Course==
It rises as a storm water conduit flowing southwards from a subdivision in southern Pomona, eastern Los Angeles County. The concretized stream soon enters southwestern San Bernardino County and runs generally southeast between the Chino Hills, to the south, and the city of Chino, to the northeast. One of the creek's main tributaries, San Antonio Creek, comes in from the left about downstream of Pomona. San Antonio Creek, which originates in the San Gabriel Mountains, drains the northern part of the Chino basin, and is longer than Chino Creek above their confluence.
From there the creek flows roughly parallel to California State Route 71 southeast, through a predominantly industrial and agricultural area. About above the mouth, the streambed changes from a concrete culvert to an earthen channel. The river then enters the El Prado Golf Course and turns south. The last portion of the creek is predominantly marshland, situated within the Prado Flood Control Basin behind the Prado Dam, and mostly in Riverside County. The main affluent, Mill Creek, joins from the left within the Basin. Chino Creek then runs south to its confluence with the Santa Ana River just north of the dam about east-northeast of Corona.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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