Re: springtime kokanee?
Kokanee tactics are very different here and there. In northern Cali, the common method is downrigging as the Kokes can be up to 250' deep. In the Northwest, jigging is the norm, but downrigging is gaining popularity. When I tell Koke fishermen on the west coast that we can catch Kokes nearly anytime of year on the subsurface, they freak. Water tempature is key to salmon fishing as it is for many species, the fact that early ice off is when they are jumping in Oregon is the water temp (of course).
As to your question of the schools here in Colorado, yes you can still jig for them in open water, you just don't cover much water, thus you lower your odds of finding the fish. It's interesting how techniques vary according to region. Learning different methods can sometimes really pay off.