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RIVER'S PATH The Lerma River originates from the Lerma lagoons near Almaloya del Río, on a plateau 2600 meters above sea level, and 24 km southeast of Toluca . The lagoons receive their water from springs rising from basaltic volcanics that flow down from Monte De Las Cruces . The river flows northwestward through México State . The river defines the short border between the Mexican states of Querétaro and Michoacán , and then continues mostly northwest through Guanajuato where it loops south where it defines the border between Guanajuato and Michoacán, then between Michoacán and Jalisco , after which, the Lerma meets Lake Chapala . Some people consider the 400 km-long Río Grande De Santiago , which continues from Lake Chapala northwest towards the Pacific Ocean , to be a continuation of the Río Lerma. If Lake Chapala were to overflow, the excess water would from into the Río Grande de Santiago, but this has not occurred since 1977 . IMPORTANCE IN MEXICO The Lerma River is not navigable by water craft, but it is critical to regional argicultural irrigation, and its flow powers several hydroelectric plants and for irrigation. The Lerma's water s also a source for the municipal water supply in the Guadalajara metropolitan area. POLLUTION The Lerma's historic reputation for polluted water has been partially mitigated by extensive government environmental programs. The Lerma River basin now has 44 wastewater treatment plants to help reduce toxic runoff into the Lerma. Another environmental threat is overuse of the Lerma's water supply, which has led to a decrease in Lake Chapala's water level, and threatens the Lake Chapala Lerma River watershed aquifers. lover SOURCES
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