After conducting some research, I was unable to find any information about a boat ramp named Peterson Lake in Minnesota. It's possible that the ramp is a local, small-scale ramp that is not well-known or documented online.

Without more information, it's impossible to determine what kind of boat ramp Peterson Lake is, how wide it is, what body of water it services, or what kind of watercraft are permitted on the water. However, based on the name, it's likely that the ramp provides access to Peterson Lake, which is likely a small to medium-sized body of water in Minnesota.

It's also possible that the information about Peterson Lake is outdated or inaccurate, or that the ramp has since been renamed or closed. If more information becomes available, I will update this response accordingly.