Your rod will probably work but you should use some sort of braided line for your mainline while plunking. I use 20lb tuff line on my shore plunking rig. I use 12-15lb mono for my dropper (lead) line. Your weight will get stuck in the rocks at some point, if you use a lighter dropper line than mainline you can break that loose and keep the rest of your tackle. If your mainline is too light you will break it and lose all your gear. Another thing, you will be casting 6oz or more of lead out into the river to hold bottom so your line and rod need to be able to handle it. Not enough lead and your line will be swept down river and either snag or tangle with others fishing the same area. You should get a plunking style rod holder as well. You can pound them into the bank and stand your rod straight up, this keeps your line out of the water which reduces drag and helps your gear stay put. If your rod is wedged in the rocks or leaning against a tree limb on the shore a salmon/steelhead can literally rip it right into the river if your not paying attention, happens every year. The bank style rod holders stand up much better to this. A heavy duty PVC pipe cut at an angle on the bottom is a cheap version of these. Use a pyramid weight as well. They hold the bottom the best. A round ball or bell sinker will just roll with the current. Good luck!
