The approval from the U.S. Army Corps of Engineers said that redevelopment of the Dixville Notch, N.H., property, which has been closed since 2011, “will have minor individual or cumulative impacts on waters and/or wetlands.” Phase 1 of the $145 million project, now contingent on approval by a county planning board, would include renovation of the Donald Ross-designed, 104-year-old Panorama Golf Course in Colebrook, N.H.