I drove up to where I thought the cat-road below Hidden Lake forked off. The lake is well named. Most maps do not show it, and you can see no reason to think there is a lake on that ridge-side. A small draw was blocked many years ago by a slide. The material that makes up the dam is so rocky and porous that no outlet stream has ever formed.
Drainage is underground.
Tall Douglas Fir surround the lake, hiding it so well it is hard to spot even from the air. After several abortive attempts, I found the right road and parked the pickup in a cluster of red alder that was growing like bamboo in and around the old cat-road. The stump with an old can lid nailed to it identified the start of the route to the lake. There was no other sign of a trail. It is not well known or heavily used.