View Spit Bridge Opening Times on the RTA's website:
http://www.rta.nsw.gov.au/usingroads/spitbridge/index.html

NB. Spit Bridge has clearance of 7m

View Middle Harbour charts on the NSW Maritime website:
http://www.maritime.nsw.gov.au/publications/maps.html
http://www.maritime.nsw.gov.au/docs/maps/middlhbr_back.pdf