NORTHPORT, Wash. – Julie Sowards’ best childhood memories are tied to the Columbia River. Leaning on a cane at the river’s edge, the 52-year-old Northport woman recalled how spring floods created the “pothole,” a swimming spot for local kids, in a sunken meadow on her parents’ ranch. Sowards and her siblings scouted for arrowheads on the Columbia’s banks. From sun-warmed rocks, they watched sturgeon in deep pools near the shore.