You can check the ODFW page, they have the stocking schedule posted under the main "fishing" tab. They stocked it on Feb. 25th. The next time they will stock it is the week of March 11th. They don't tell you which specific day they will be there. The problem with Junction City Pond is that a lot of people watch for the stocking truck to back up to the pond and then it is like "combat" fishing just to find a space on the bank to throw out a line. It is usually fished out within the next 5-6 days, then nothing!
I know this is only my own opinion, but, there's not much sport in that. If you go, I would suggest getting out there just as early as you possibly can. When there are fish, the PowerBait should work just fine. I, too, might take Troutdude's advise and try the Power Eggs.
Good luck to you, and welcome to the board.