Linden Ridge

I've emailed off the SCA at Penright asking about access past the linden observatory on Glossop Rd
this appears to be a nice thick red line on the Woodford Dam map and should ? be allowed with the recent dam access.
(I posted some new pics for approval)

but the gate at the observatory is straight closed, walkers only with no idea as to why or who to contact.
fingers crossed, there is some nice Garmin trails avail to look at, and two ridges, like Warrimoo