Spacious sites with fire pits. Vault toilet and trash. A few minutes down the road from the Bickel Knob fire tower.
As far as camping goes, the loop area is a bit cramped for my taste, but if that doesn't bother you it's fine. Clean bathhouse and convenient outdoor sink for washing up after dinner. Overall one of the best PA parks and well maintained.
I really have to address some of these other reviews, though:
"Water was thick with weeds& lilies but ok nonetheless." Wow! Pitcher plants, sundews and water lilies are not "weeds." They are unique to bog environments and don't grow in other places. The vegetation in the lake is what makes Black Mo black, so picturesque and unlike other PA parks!
"The overall area has nothing to do. And I mean NOTHING. We drove 45 minutes to Altoona to see the famous Horseshoe Curve but there’s literally nothing else around for miles and miles. Not even an ice cream stand, or not one we could find. And, since there’s no cell service, we couldn’t figure out any options either." Like many state parks in this part of the world there is no cell service, so you need to bring a real map (Purple Lizard) and look a few things up on the internet ahead of time. Black Mo is literally ten minutes from Philipsburg where there is surely an ice cream stand, 25 minutes from State College, which has tons of touristy offerings…I could go on but really this is laughable.