Just thought I would post a view of the river around and mark a few things so people new about them.
First is the sand bar straight out from the launch. I watch someone hit it every weekend. Some of it sticks out but most of it is just inches underwater. You can drive around it and then follow the yellow line up into North Lake. I have done it as well as others. I don't go very far into North Lake, just usually into the mouth of the lake. Most of North Lake is pretty shallow 5 ft or less. I just don't know it well enough to give recommendations.
When leaving the marina stay in the maintained channel until you go threw the buoys and past the Marina sign that's on the main river channel. You can venture out of it the channel and a good portion of it is deep enough, however there can be logs and debris floating/ submerged. I have also been told that there is a stump field out there somewhere as well.
In the main river channel like anywhere on the river you need to stay in the main channel between the green and red buoys. Remember RED Right Return. Meaning you want the Red buoy on your right side when going up river. This section of the river doesn't have any no wakes other then by the marina and then once you get up to Prescott where the St Croix and The Mississippi meet. Also there are not big large areas that you really need to worry about getting out of the main channel, its marked pretty well.