Nice route!
When Kushog Lake Road is not so sandy and you can ride it safely at a slightly faster pace, it feels like a super hilly rollercoaster.
Also the loop around Little Kennisis Lake along Watts Trail below is one of the hilliest backroads I have been on in Ontario. There are lots of cottages along the road and there are way too many hilly/blind corners to go quickly, but it's a really fun road. Hopefully next time you get a chance to go up there, you can check it out. After the Watts Trail loop, you can continue along Kennisis Lake Road for about 5-10 minutes until it basically ends. It's more of the same, with super tight turns, except the pavement quality declines a fair bit after the entrance to Watts Trail.
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Lastly, on the top left corner of the Watts Trail loop above, you can see a gravel road that goes up past Johnson Lake. There is a big steel gate that limits access to that road from Watts Trail. If you come at it from the northeast end from Livingstone Lake Road #12, it's a fun ride along Bear Lake Road, which is basically a really nice fire access/cottage road that becomes a private road (logging I think) all the way over to the steel gate at Watts Trail.
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