Trails have been cut (and made by use) to the river's edge by blackberry fanciers, who enjoy picking the native fruit from July through October. The paths, which receive little or no maintenance and are overgrown, explore a woodsy environment around the campground, between the river and the lake. Not only are the paths poor, but access is difficult; there's no day use area on the river side of the park. Best bet is to ask rangers if you can leave your car near the park entrance station and walk into the campground where the trail begins.
About 25 miles east of Modesto on the south side of the Tuolumne River. From Modesto take Highway 132 East 14 miles to Waterford; in Waterford turn right on Hickman Road (county road J-9) and drive 1 mile to Lake Road. Turn left on Lake Road and drive 10 miles to Turlock Lake SRA.
http://www.tripleblaze.com/trail.php?c=3&i=3602