I do have a map that shows the waterflow, but it’s not a electronic copy. Basically the flow starts at the boat ramp access near the Horseshoe/Becker lake split, it then runs through the top of horseshoe lake into East lake and hangs a right after the bridge, it then goes into Koetter lake (It turns to the left and avoids Ceder Island Lake) and flows down through Zumwalde through Great Northern through the narrow channel that leads into the large drop off into Krays lake, then into Knaus lake and finally flows through the narrow channel and goes under Highway 23 into the dam in Cold Spring.
Here’s a link to a super High res map file http://www.srcl.org/maps.htm