Lisa Nisenfeld will depart as president of the Columbia River Economic Development Council at the end of September after a two-year tenure marked by conflict with Clark County commissioners over the Columbia River Crossing, a highly secretive courtship of Nike and progress on implementing a countywide economic development plan.Nisenfeld, 59, is set to begin work in October as head of Oregon’s troubled Employment Department, Oregon Gov. John Kitzhaber announced Monday. Nisenfeld will oversee some 1,300 employees, a giant leap from the seven-person staff at CREDC.The CREDC will start an immediate search to replace Nisenfeld, said Bill Dudley, a Vancouver attorney who is board chairman of the 140-member public-private economic development and job recruitment organization. “We’re going to miss her, but I think it’s a great opportunity for someone with her skills,” Dudley said. Nisenfeld, he said, had “strengthened the relationship with our partners, taking communication to a whole new level, which has been great.” Nisenfeld, who lives in Clark County but will move to Oregon, said she hadn’t been looking for a job but was recruited by Kitzhaber and his staff. She concluded the Oregon job was too good of an opportunity to pass up.