Around 1969/70 with Mike Peloquin and Steve Devlin ( my OB assistants) on request from Maine Outward Bound School we opened up Otter cliffs with about 14 new climbs from around 5.5 to 5.10.... some for our own personal fun, the more moderate ones for the use of students. The only sign of any activity ( as most climbs had some loose rock) was a piton in the easy chimney behind the climb that is now called Rock Lobster.Still have dated slides of some of these ascents one being the obvious Rock Lobster.
Otter Cliffs is a Top-Managed climbing site. If you don't know how to safely belay off the anchor, or how to rig some of the anchors, PLEASE seek qualified instruction. There have been a number of accidents and near misses as a result of inappropriate belay/anchor techniques.
Not all of the climbs have anchors at the top. There are bars and I-bolts near 'In The Groove', 'Wonder wall' and immediately surrounding climbs. If you want to climb elsewhere bring a light rack to build your own anchors.