Re: Slippery Rock - where is it?

You are talking two different places.  Slippery Rock, also called, slide rock, is accessed from the back end of Stanislaus River Campground, which is on the Spicer Res Rd, just before the bridge at the Stan River.
It is a swimmer's delight.  Not this time of year, however.Levels are down.  You would park in the day use area, hike back through the campground, head to the river and beach and go south.  You will find it.

Slick rock rd....is the green sticker only OHV road from So Lake Alpine down to Utica Res.  Put in originally by the Utica mining company to service the res.  That used to be the only road from Silver Valley aka Lake Alpine to Utica, Union and old Spicer Res.

There is an OHV trail handout at the Calaveras Ranger District office in Hathaway Pines, and at Alpine Station in the summer.  We are closing down after this Sunday.  End of season!  
Check out the Ebbetts Pass Historical Assoc Museum this winter.... I am there with info on all these OLD roads and secrets. Summer I am at the Alpine Ranger Station.  ~  Susi Schimke Lewis