Resevoir your talking about is in east SaintJohn Lakewood, Im not sure where you are at, but if you go to the top of McCallister Drive take a left at the intersection by the fire station and head down lochlomand road untill you see a little yellow store on your right, a small pond beyond that and across the street is the resevoire, parking lot and everything cant miss it. Not much in there though but suckers, Chlorine leak a number of years ago seemed to kill almost anything, not much luck for browns, your better off up further, in the 1st loch lomand or second.
You can fish both Robertson and the Rez. The Rez did have good sized trout in it, a friend at my office got a 26 in trout in there in 2010. Robertson is connected to First Loch Lomond and has the same fish.
Comforteagle, if the lake you posted the link to is the one you mean, then yes, you can fish in there. I'm not sure if you're allowed a motor boat in there, though, and if you can, I don't think it could be bigger than a 2.2 hp, but you CAN canoe or kayak in there.