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F:' <br />Class <br />Ordinary high water <br />level setback {feet) <br />Unsewered Sewered <br />Setback from top <br />of bluff (feet) <br />Natural environment <br />Recreational development <br />General development <br />Remote river segments <br />Forested and <br />transition river segments <br />Agriculturalr urbanr and <br />tributary river segments <br />150 <br />100 <br />75 <br />200 <br />150 <br />75 <br />50 <br />200 <br />30 <br />30 <br />30 <br />30 <br />150 150 <br />100 <br />(2) Exceptions to structure setback standards in <br />subitem (1). Where structures exist on the adjoining lots on <br />both sides of a proposed building site, structure setbacks may <br />be altered without a variance tc conform to the adjoining <br />setbacks provided the proposed building site is not located in a <br />shore impact zone or in a bluff impact zone. <br />B* .iigh water elevations. In addition to the setback <br />reguirements of item A, local shoreland controls must regulate <br />placement of structures in relation to high water elevation. <br />Where state-approved, local flood plain management controls <br />exist, structures must be placed at an elevation consistent witn <br />the controls. Where these controls do not exist, the elevation <br />to which the lowest floor, including basement, is placed or <br />flood-proofed must be determined as follows: <br />(1) For lakes, by jjiacing the lowest floor at a <br />level at least three feet above the highest Known water level, <br />or three feet above the ordinary high water level, whichev*er is <br />higher. In instances where lakes have a history of extreme <br />water level fluctuations or have no outlet capable of keeping <br />the lake level at or below a level three feet above the ordinary <br />high water level, local^controls may require structures to be <br />placed higher. <br />(2) For rivers and stiej'.. by placing the lowest <br />floor at least thfee feet above the flood of record, if data are <br />available. If data are not available, by placing the lowest <br />floor at least three feet above the ordinary nigh water level, <br />or by conducting a technical evaluation to determine effects of <br />proposed construction upon flood stages and flood flows and to <br />establish the flood protection elevation. Under all three <br />approaches, technical evaluations roust be done consistent with <br />parts 6120.5000 to 6120.6200 governing the management of flood <br />plain areas. If more than one approach is used, the highest <br />flood protection elevation determined must be used for placing <br />structures and other facilities. <br />(3) Water-oriented accessory structures may have <br />the lowest floor placed lower than the elevation determined in <br />this subpart if the structure is constructed of flood-resistant <br />materials to the elevation, electrical and mechanical equipment <br />is placed above the elevation and, if long duration flooding is <br />A-1.24