What resevoir? There was supposed to be a resevoir, and land was set aside. It never panned out and is just a state managed area now.
I have never fished it but have walked along it for some length. I'm sure it has a typical mixed bag of central NJ warmwater fish in it. Bluesgills, some small largemouths, suckers, shiners/dace, snapping turtles, etc
Also gets very low at times.
~James