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Based on the available information, the Edna Lake Road boat ramp in Nisswa, Minnesota is a public boat access site managed by the Minnesota Department of Natural Resources (DNR). It provides access to Lower Cullen Lake, which is part of the famous Whitefish Chain of Lakes in Northern Minnesota.

The boat ramp itself appears to be a concrete ramp with a relatively modest width, likely suitable for launching and retrieving small to medium-sized watercraft. According to the DNR website, the ramp is 20 feet wide, which should be sufficient for most recreational boats and fishing vessels.

As for the types of craft allowed on Lower Cullen Lake, the DNR states that motorized boats are allowed, including those with outboard motors, inboard motors, and electric motors. However, there may be restrictions on the use of certain types of watercraft, such as personal watercraft (PWCs) or water skis, depending on the time of day and specific regulations in effect.

Overall, the Edna Lake Road boat ramp in Nisswa appears to be a serviceable public access site for boaters and anglers looking to explore the beautiful Whitefish Chain of Lakes in Northern Minnesota. As always, it's important to check the latest information from the DNR or other relevant authorities before planning a trip to the area, as regulations and conditions can change over time.