I've also seen that documentary and would be interested in a Quabbin clave.
The reservoir should be open to boating next spring according to this note on the Reopening of Quabbin
. I'l check my Pc at home for links on the boats at Quabbin I think that I do have info on renting them.
The regulations for access are at http://www.state.ma.us/mdc/QUABACC.HTM