23 22 In 2009, the invasive zebra mussel was found in Lake Texoma, which is the source for approximately 25 percent of the raw water supply for the North Texas Municipal Water District (NTWMD). At the time, the water was pumped over the high point in the basin and discharged into a creek that flowed to Lake Lavon. However, the U.S. Army Corps of Engineers issued a directive to cease pumping operations to prevent the mussel from being transfe

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