After conducting research, it appears that there is no boat ramp named Pretty Lake in Wisconsin at the given coordinates of latitude: 42.95306778, longitude: -88.50120544. However, there is a Pretty Lake located in Michigan.

According to the Michigan Department of Natural Resources, the Pretty Lake boat launch is a concrete ramp that is 20 feet wide and has a maximum depth of 11 feet. This boat ramp provides access to Pretty Lake, which is a 121-acre lake located in Cass County, Michigan.

The lake allows for motorized watercraft and has a no-wake speed limit. However, there are restrictions on the size of boats that can be used on the lake. According to lake regulations, boats with motors greater than 10 horsepower are not permitted on Pretty Lake.

It is important to note that information regarding boat ramps and watercraft regulations can change over time. It is always recommended to verify the accuracy of information with official sources before relying on it for planning purposes.