The maps you can buy at most tackle shops have the Potholes map. I think they are made by "Hot spots" map company or something like that. They don't make one for Silver Lake though. I think the only maps by them for Washington cover the Sound, Columbia river, and Lakes Washington, Sammamish, Potholes and Banks. Those are the only ones I can think of off the top of my head.

This site has topo maps for many lakes (look in the column to the right once you get into the site under the "features" section).  I see that they have a map for Silver Lake, but not Potholes.  8)
http://washingtonlakes.com/

is there a good source  for lake maps, particularly interested in Silver and Potholes  thanks