I climbed a beautiful handcrack on the left side of that in 1988 and left a medium sized hex from which I bailed. I had some non climbing friends in tow and felt that going to the summit would over involve them. It would have been pretty easy to get from the point where I bailed to the Summit however. The hand crack was probably 5.8.
Blodgett canyon is amazing i cant believe more people dont climb this area more. Im there every week and i never see anyone. as for the arch, it would be cool to climb it someday but like someone said the approach is heinous for such a small objective. also blodgett is not granite it is milonite a metamorphosed igneous rock.