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Water Access: Boat Ramps
<br /> Private ramps:site and construction criteria
<br /> • The site can support a ramp without pilings,dredging,or other
<br /> special site preparations.
<br /> • The ramp will be constructed of gravel,natural rock,steel
<br /> matting,or other durable inorganic material not exceeding
<br /> 7 inches in thickness.
<br /> • The ramp will be no more than 12 feet wide along shore and (above) Using the motor to push a boat onto
<br /> 10 feet waterward of the shoreline or into a water depth of 4 feet, a trailer(known as power loading) damages
<br /> whichever is less. boat ramp sites. The spinning propeller can
<br /> • Excavation of no more than 5 cubic yards(to create a suitable erode sediment beyond the edge of the ramp
<br /> slope and launching area)and placement of no more than 5 cubic surface, creating a hole just past the ramp, and
<br /> yards of crushed rock, gravel,clean sand,or small stone are the sediment can create a mound beyond the
<br /> allowed to provide a stable base or maintain use of the ramp. hole. Ttailer wheels might suddenly drop into
<br /> • The site is not a federally designated wild and scenic river. the hole, and boats might run aground against
<br /> the mound. (illustration from Design Handbook for Rec-
<br /> reational Boating and Fishing Facilities,Second Edition,
<br /> Public ramps: site and construction criteria 2006,by States Organization for Boating Access)
<br /> • The requirements are the same as above,except the ramp can be up to 36 feet wide and 30 feet waterward of the
<br /> shoreline or into a water depth of 4 feet,whichever is less.
<br /> • No more than 200 cubic yards of excavation is allowed,and placement of no more than 80 cubic yards of crushed
<br /> rock,gravel,clean sand,or small stone is allowed to provide a stable base or maintain use of the ramp.
<br /> If the proposed ramp cannot meet all of the preceding criteria,a permit from the DNR is required. Contact your
<br /> DNR Area Hydrologist for assistance.
<br /> Construction specifications
<br /> Construction materials allowable for the installation of
<br /> ramps include poured concrete,natural rock,precast concrete,
<br /> gravel,and steel matting.All may require periodic mainte-
<br /> nance from vehicle use and lake ice expanding and pushing
<br /> against the ramp in winter.
<br /> The slope of the boat ramp should be steep enough to
<br /> launch the boat without the vehicle entering the water.
<br /> such as a floating sift fence(pictured above)to limit Generally,ramp slopes from 15 percent(1.5 feet of drop
<br /> the spread of sediment stirred up by construction. The over a 10-foot length)to 12 percent ensure that boaters will
<br /> removal or destruction of aquatic plants to install a boat have little trouble launching or pulling their boats from the
<br /> ramp is an activity regulated by the DNR. if your plans water. If the slope is steeper than 15 percent,retrieving a
<br /> affect aquatic vegetation, please contact a regional DNR boat and trailer is difficult.A slope of less than 12 percent
<br /> Fisheries office because a permit may be required under
<br /> the Aquatic Plant Management Program. will also cause a problem;the flatter the slope,the farther
<br /> a vehicle must back into the water so that a boat can float
<br /> free of its trailer.
<br /> ON_ Contact Information 161 iii a
<br /> ONRInformation Center is 11R etatagical rtd Water Resources i dl oh,mquest.
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<br /> Water Access:Installing a Boat Ramp 0 2008 State of Minnesota,Department of Natural Resources Page 2 of 2
<br /> August 20081revised March 2012
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