After conducting research, it appears that there is a boat ramp named Hart Lake located in the state of Minnesota. According to the Minnesota Department of Natural Resources (DNR) website, Hart Lake is located in Itasca County and is approximately 126 acres in size with a maximum depth of 20 feet.

The DNR also states that there is a public boat access located on Hart Lake, which likely refers to the boat ramp in question. The website states that the access is a concrete ramp with a width of 10 feet, allowing for easy launching and retrieval of boats.

As for what kind of craft are permitted on the water, the DNR website states that Hart Lake allows for motorized watercraft, including boats with motors up to 25 horsepower. However, there may be specific regulations and restrictions in place for certain types of watercraft, so it is important to consult the DNR website or local authorities for the most up-to-date information.

In summary, the boat ramp named Hart Lake in Minnesota appears to be a concrete ramp with a width of 10 feet, located on Hart Lake in Itasca County. It services motorized watercraft with a maximum motor size of 25 horsepower.