JCOS recently launched a website to host their climbing information:
Boulder Canyon is at the forefront of local climbing stewardship. The myriad and mixed land owners have prevented previous erosion control work of any magnitude. But in 2016 FRCS put in a month of work at Plotinus Wall, which sits on USFS land. Since much of the climbing is on USFS land, this was a ground-breaking project that opens the door to much-needed work throughout the canyon.
Since then we have done a major crag inventory and have ranked them based to popularity and need (results below). During this process representatives of BCC walked and gathered GPS coordinates for many crag approaches in the canyon, and generated these awesome Boulder Canyon climbing maps (thanks Marty Petach and Roger Briggs for the big effort):