The Stream Protection District includes all land areas within 75 feet, horizontal distance, of the normal high-water line of a stream, exclusive of those areas within 250 feet, horizontal distance, of the normal high-water line of a great pond, or river, or within 250 feet, horizontal distance, of the upland edge of a freshwater wetland. Where a stream and its associated shoreland area are located within 250 feet, horizontal distance, of the above water bodies or wetlands, that land area shall be regulated under the terms of the shoreland zoning district associated with that water body or wetland.