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Lower Santa Cruz River Alliance A community partnership advancing regional flood control solutions to prevent severe flood damage from the lower Santa Cruz River LEARN MORE MARICOPA CASA GRANDE HIGHWAY MARICOPA COUNTY AZ 1983 VEKOL WASH WELCOME TO LOWER SANTA CRUZ RIVER ALLIANCE The river has a long history of producing catastrophic flows during major storms. The Lower Santa Cruz River Alliance is an Arizona 501 c 6 nonprofit corporation dedicated to identifying and securing a comprehensive regional flood control solution and related enhancements in the Lower Santa Cruz River Watershed. Read More ABOUT US About Lower Santa Cruz River Watershed The Alliance was formed in response to that threat which has become especially acute due to the dramatic population growth in the area over the past decade. Governors Event March 9 2012 The Lower Santa Cruz River Watershed has a long history of producing catastrophic floods during major storms resulting in severe damage to crops farms housing communities businesses and infrastructure.