After conducting research, I could not find any specific information about a boat ramp named Big Island Lake in Minnesota. However, there is a Big Island on Lake Vermilion in Minnesota (latitude: 47.7105° N, longitude: 92.2953° W), which has a public boat ramp.

The boat ramp at Big Island on Lake Vermilion is a concrete ramp that is approximately 16 feet wide. It services Lake Vermilion, which is a large, popular lake in northeastern Minnesota known for its fishing and recreational opportunities. The lake covers over 40,000 acres and has over 365 islands.

At Lake Vermilion, there are no restrictions on the type of watercraft allowed on the water. However, there are specific regulations regarding boat speed limits and watercraft usage in certain areas of the lake. For example, there are no-wake zones near some of the lake's marinas and resorts. It is always advisable to check with local authorities or the Minnesota Department of Natural Resources for the most up-to-date information on boating regulations and restrictions.