It is not an actual park, it is off the road on someone's land. As for whether is is accessible for photography, the nests are maybe about 300 metres off the road (just a rough guess, I'm not too good at guessing distance). I know some people have super zoom lenses for there cameras, but as I'm not a photographer myself, I don't know how far they can shoot. To get to the nests, you go north on Brock Rd. and go through Brougham. Continue north past the next road (concession 7) and the nests are a little past there on your left.
I hope this helps,
Mark