I've heard locals (i.e., not University folks) call it Day Lake, and the road in is still called Day Lake Drive. Ask Google maps to find Lake Dimmick, and here's what you'll see: "Your search did not match any locations." Now try Day Lake.
View Larger MapBefore I became interested in walking with my camera, all I knew about Lake Dimmick was the slogan "Save Lake Dimmick."
Day Lake or Lake Dimmick: a fine place for a walk and thoughtful consideration of town, gown, development, and nature's plan.