Yes Darell,there is a very good map of the gorge available. I see that your in Cali.so I don't now of any place close that would have them..I believe that both buckboard and Lucerene marina's would have them Also both the local Sportmens Warehouse and Cabala's might .Hopefully someone else will chime in and be able to help.
These are the same maps I use in California. I saw one in the Buckboard Marina and should have bought it. I don't know how detailed it was but they are usually pretty good. From my educational trip with Jared, Buckboard is the Fisherman's ramp and place to be and Lucerne gets into the summer skier / party zone. We saw very few skiers at BB launching and on the water and we ran south a good deal to fish in the mornings but it was worth it.