Overview. Bacteria concentrations are occasionally elevated in portions of the Trinity River that flow through Dallas and Tarrant counties. High bacteria concentrations might pose a risk to people who swim or wade in natural waters.
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Swim only in designated areasSwimming is permitted at select locations in Lake Lewisville, Grapevine Lake and Lake Ray Hubbard, for example. However, swimming in White Rock and Bachman lakes is prohibited. According to Dallas' park department, the prohibition is for safety reasons.