FYI, Oregon Fishing (Moon Outdoors series) says that Stripers are catch and release only. And it says that "fishing deadlines exist all over the river". So, it would be a good idea to read the reg's carefully. Wouldn't want to see you guys get any tickets.
According to that same book, stripers can be caught in the spring in the Smith.
According to Fishing in Oregon, "in March, April, and May Striped Bass are upstream in Tidewater, where anglers take them on trolled plugs and a variety of baits including herring, anchovies and sea and mud worms". Also, "stripers return to the bay in late Spring, summer and fall to feed on marine fish, then return to the river in September and October when the best catches are made".
That book also says that there is a good shad run in May. So, maybe pulling shad-colored plugs is a good idea.
BTW, in the mid-70's one of my Uncle's bagged a 42-pounder. It made my cousin's 17 incher look like a midget! LOL
Good luck bro.