Thye channel should hold 7'+ I heard a boat with 7.5' was fine. We draw 5'9" and people laughed when we asked if was OK... 'You can go anywhere' well... almost:
In bridge channel is deep, do not turn to stbd until you are in the line of the channel markers (red to port, green to stbd) and then do a hard turn... there is some room on the inside of the turn, but it often has anchored boats.. and if not, it is a good temp anchor spot. Once in the channel, stay in the middle. The buoys are in 3' water
. At the last buoy, you will see a red mark to port and it looks like you could head
off that way towards the witches tit anchorage. DO NOT TURN THERE. Go further down the channel until you are lined up with deep draft
boats to port and then turn towards dutch side. Move across and then up into anchorage.
Google Earth screenshot Not for navigation, just a quick hand draw to give you an idea!
A few more tips: Grand Marche supermarket in Cole Bay is amazing and will deliver to any dock
for free. You can dink there via the Princess resort (name?) close to the witches tit anchorage. Tie up at dock
next to bridge and walk to store.