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Water Quality in the San Juan Basin

The San Juan River Basin is an important economic as well as environmentally sensitive area that has become the focus of several outstanding pollution prevention and restoration efforts in recent years.  This site has been developed to help promote understanding the many complex issues which affect the Four Corners region today.

The San Juan River is a major tributary of the Colorado River.  The watershed is located in the upper northwest corner of the state.

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Arising on the western slope of the Continental Divide in southwestern Colorado, the San Juan River flows from the San Juan Mountains north of Pagosa Springs, Colorado, and enters the extreme northwestern section of New Mexico via Navajo Reservoir in Rio Arriba County to the west of the Jicarilla Apache Reservation and the Carson National Forest. The course of the San Juan River in New Mexico turns westward for some 140 miles before the river turns back north and re-enters Colorado just a few miles to the east of the cartographic landmark known as "Four Corners". The San Juan River then resumes its westerly direction across Southern Utah towards its confluence with the Colorado River. 

This page last updated November 08, 2007

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