Thanks for the directions. I will have to give it a try. I got one of those maps from the Northwest Adventure Center and it showed that I should go south on I-5 (from the base) then take it all the way to Marvin road exit and head towards yelm. I think that way is way too long so I am going to try the way you suggested after my kids wake up from their nap.

I think the lake is only open to DoD employees since it is on post. Sorry:(