Google Earth has been the biggest help for me for finding access to streams. Go online and look up Pennsylvania Spatial Data Access, (just type PASDA into google) and search that site. You can find just about anything you need there. It has layers for mapping such as stocked trout waters, class A waters, wilderness trout streams. Basically all of the data that the PFBC interactive map has.
Another big help from that site is you can find layers that show boundaries of public lands in PA like game lands and parking areas, state parks, and things of that nature. Once you download all the files you want from there you can upload them into google earth and create your own personal map to find all of the class A water you want.
One other site to check out is wildtroutstreams.com. This site has a download of all of PA's streams with trout reproduction in them that breaks the streams down in class A, B, C, and D. Very helpful tool.