duck hunting at the NB SB raritan river confluence

[tycomps]

Last fall I was fishing at the confluence of the NB and SB at #1 on the map. I looked up the SB and saw what looked like a bunch of pinwheels spinning in the middle of the river at #3. since my #1 spot was dead I decided to walk up around the bridge, thru the launch lot and check out a hole I knew near #3. as soon as I approached #3 I heard whistling from a duck blind and realized the pinwheels where decoys. I turned around, went back to my truck and left. This year I'm running my boat up the SB past #3 as I did in the spring. I understand they're probably shooting straight across the river with low velocity bird shot but I still don't want to catch bird shot in the ass from a ricochet. does anyone know if duck hunting is legal there?