Yes.
It ended up being one our more enjoyable trips.
After being housebound all winter, we finally managed to sneak a couple days off work in Feb for a 4 day weekend. The forecast was for scattered showers but we were stir crazy and needed a camping fix, so we went anyway to Lake Oroville.
It poured all weekend. Raining in horizontal sheets almost constantly.
It almost beat us, but we stuck it out. Played games, read a lot.
The plus side is we had the whole campground to ourselves as everyone else left. There were the occasional breaks in the storm. When the rain temporarily abated the wildlife really came out in force. Squirrels, birds, and a fox were wandering through the empty campground after being denned up for days.
Loved it!