The yard bordering on a river or other navigable waterway may be designed as a front yard if the water frontage conforms to the minimum lot frontage of the zone district.

If the yard is so designated then the minimum required lot frontage on an improved street shall be provided as specified in subsection 30-7.6 of this section for a lot fronting on a river. In any subdivision, the road frontage reduction permitted by this provision may only be applied to one lot.

Accessory buildings shall conform to subsection 30-7.8 of this section.

Yard restrictions shall be subject to subsection 30-7.7b of this section.

The minimum setback from a river, except for accessory structures provided for in subsection 30-7.8e of this section, and docks and bulkheads, shall be the greater of 50 feet or the average of the existing setback of structures on the abutting river front property. However, in no event shall the required setback be more than 75 feet.

In all zones fronting on a river, the height of hedges, screen plantings, walls or fences between residential properties shall in no event exceed three feet within the required river setback; provided, however, this section shall not be construed to prohibit the planting of shade or ornamental trees either individually or in small groupings.