This review is for the group campsite at McCarthy Beach State Park, which is the only camping spot on Sturgeon lake, and separate from the main state park campground which is located on nearby Side Lake. (see photo with map, I added a blue arrow to direct to the group site) 

The group campsite has a nice log building for group gatherings, plus plenty of space for tents to accomodate up to fifty people. A small camper or two could alo fit, but there are no RV hookups here. There is water as well as fire rings and picnic tables. There is a pit toilet and no showers on the actual group site--however, the group site is located immediately adjacent, and a short hike to, the main state park beach and picnic area, which has a beautiful new bath house complete with running water, showers, and regular bathrooms. The group campsite is located on a bluff with a beautiful view over Sturgeon Lake. The boat launch is located on the east side of the group camp site, and has a nice dock, so is convenient for paddlers, boaters and fishermen alike. It really is the best camping spot in the whole state park, and worth the extra cost to round up an extended family or friends  group, youth group, scout group, or whatever. Note, all reservations for this state park's campsites are now being done on line at https://reservemn.usedirect.com/MinnesotaWeb/   at that link, select mcCarhty Beach State Park, then select group campsite at Sturgeon lake.