The trail to Lake Sawyer begins at a parking area at 13500 Lake Sawyer Road East in Black Diamond.  It is easy to miss the gravel acess road that looks like a private driveway.
You can also reach Lake Sawyer through a maze of trails from the Black Diamond Natural Area parking on Highway 169 just north of town.
The main acess begins as a fine gravel road, but soon turns off onto a winding trail.
It suddenly drops down steeply to the lake.
Then you have to climb back up.