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Where state-approved,local flood plain management controls exist, structures must be placed <br /> at an elevation consistent with the controls. Where these controls do not exist, the elevation <br /> to which the lowest floor,including basement, is placed or flood-proofed must be determined <br /> as follows: <br /> (1) For lakes, by placing the lowest floor at a level at least three feet above the highest <br /> known water level, or three feet above the ordinary high water level, whichever is higher. In <br /> instances where lakes have a history of extreme water level fluctuations or have no outlet <br /> capable of keeping the lake level at or below a level three feet above the ordinary high water <br /> level, local controls may require structures to be placed higher. <br /> (2)For rivers and streams, by placing the lowest floor at least three feet above the flood <br /> of record, if data are available. If data are not available,by placing the lowest floor at least <br /> three feet above the ordinary high water level, or by conducting a technical evaluation to <br /> determine effects of proposed construction upon flood stages and flood flows and to establish <br /> the flood protection elevation. Under all three approaches, technical evaluations must be <br /> done consistent with parts 6120.5000 to 6120.6200 governing the management of flood plain <br /> areas. If more than one approach is used, the highest flood protection elevation determined <br /> must be used for placing <br /> structures and other facilities. <br /> (3)Water-oriented accessory structures may have the lowest floor placed lower than the <br /> elevation determined in this subpart if the structure is constructed of flood-resistant <br /> materials to the elevation, electrical and mechanical equipment is placed above the elevation <br /> and, if long duration flooding is anticipated, the structure is built to withstand ice action and <br /> wind-driven waves and debris. <br /> C. Bluff impact zones. Structures and accessory facilities, except stairways and 53� <br /> landings, must not be placed within bluff impact zones. <br /> D. Steep slopes. Local government officials must evaluate possible soil erosion impacts <br /> and development visibility from public waters before issuing a permit for construction of <br /> sewage treatment systems,roads, driveways, structures, or other improvements on steep <br /> slopes. When determined necessary, conditions must be attached to issued permits to prevent <br /> erosion and to preserve existing vegetation screening of structures, vehicles, and other <br /> facilities as viewed from the surface of public waters, assuming summer, leaf-on vegetation. <br /> E. Proximity to unplatted cemeteries and significant <br /> historic sites. No structure may be placed nearer than 50 feet from the boundary of an <br /> unplatted cemetery protected under Minnesota Statutes, section 307.08, unless necessary <br /> approval is obtained from the Minnesota State Archaeologist's Office. No structure may be <br />