I use the forestry maps and zoom in to the region I want and screenshot them. They work pretty well and match up with the campsites and portages.
They changed their site interaction and it's a bit more cumbersome now, so you'll have to do some exploring to figure it out. Basically, though, if you can find the 5 digit numerical code for the region (it may be a lat/long reference?) you can get nice maps with topography. For example, Fourtown Lake is in the pack 48091.
Here is a link to the site.
USDA Forestry Service Maps Good luck!