The Kowalski trail offers the hiker 2.5 miles following the reservoir's west edge. You must cross the dam to access the trail.
Located about 27 miles west of Williams or 14 miles east of Clearlake Oaks on Highway 20. Turn north on Walker Ridge Road, a graded gravel road, into the recreation area.
http://www.tripleblaze.com/trail.php?c=3&i=8108