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Two-family or duplex 17,500 sf 26,000 sf district Riparian dedication not required, unsewered Single family detached 40,000 sf 80,000 sf Same as zoning district Minimum lot widthf Riparian dedication required Same as zoning district Riparian dedication not required, sewered Single family detached 80 feet 125 feet 80 feet Two-family or duplex 135 feet 225 feet 115 feet Notes to Table 17-3: a. Reduction of the required setback from a historic site is permitted with the approval of the office of the Minnesota State Archeologist. b. Where structures exist on both sides of a proposed building site, structure setbacks may be altered without a variance to conform to the adjoining setbacks from the Ordinary High Water Level (OHWL), provided the proposed building is not located in a shore impact zone or bluff impact zone. c. With the exception of public crossings of public waters, roads, driveways and parking areas shall meet the minimum structure setback. Where no alternative exists, such improvements may be placed within the required structure setbacks provided they are designed to adapt to the natural landscape, soil erosion is minimized and no construction shall occur in shore or bluff impact zones. Exceptions to setback requirements must comply with the rules and regulations of local watershed districts. d. Commercial and public and civic uses with public waters frontage shall be setback double the required setback or be substantially screened from the water by vegetation or topography, assuming summer, leaf -on conditions. e. The maximum amount of impervious surface allowed for sewered lots zoned Rural Single Family (RS) is 15% of lot area or 6,000 sf, whichever is larger. f. Minimum lot size and width requirements apply to residential uses only. 4. Design Criteria for Structures a. Water Oriented Accessory Structures. Each lot may have one (1) water oriented accessory structure not meeting the normal structure setbacks if the structure complies with the following provisions: Structure Height. The structure or facility must not exceed ten (10) feet in height, exclusive of safety rails, from the average grade of the structure to the peak of the roof. Detached decks must not exceed eight (8) feet above grade at any point. ii. Structure Size. Water oriented accessory structures cannot occupy an area greater than two -hundred and fifty (250) square feet. iii. Structure Setback. The setback of the structure or facility landward from the Ordinary High Water Level (OHWL) must be at least ten (10) feet on a recreational development lake and fifty (50) feet on a natural environment lake. iv. The structure or facility must be treated to reduce visibility as viewed from public waters and adjacent shorelands by vegetation, topography, increased setbacks or color, assuming summer, leaf -on conditions. V. The roof of the structure may be used as a deck with safety rails, but must not be enclosed or used as a storage area.