I also took the spur trail into the subdivision because there were so many trails back there and I wasn't sure which trail was the portage. The start of each portage is well marked with the green portage trail but I didn't know which way to go at intersections.
I thought there used to be a portage from Black Point Lake into Frederick Lake bit I was unable to find it.
I have some free time later in fall and would be happy to help with some trail maintenance if there is a small group doing some and Covid allows for it.
Lesley