Additional tests were conducted in an existing 1:100-scale model of the entrance of Rogue River to determine shoaling patterns wave heights, water-surface elevations, and river current velocities in the lower reaches of the river. The improvement plans involved reorienting the mouth of the river; decreasing the width of the entrance; and installation of weir sections in the north and south jetties. Among the conclusions from test results are: (1) The narrower, reoriented entrance of Plan 12 will generally result in smaller wave heights in the small-boat basin and lower reaches of the river than those obtained for existing conditions when the shoal is not present. Wave heights will be substantially higher in the new entrance area, however, than in the existing entrance. (2) Sediment will move into the new jettied entrance of Plan 12 for waves from all directions and may eventually migrate upstream and form shoals adjacent to the new structures that could restrict or prohibit navigation. and (3) the new entrance of Plan 12 will result in substantial increases in water-surface elevations (in excess of 7 ft for the higher discharges) in the lower reaches of the river when compared with stages obtained for existing conditions with the shoal removed.