I wouldn't even want to guess how many thousands of kokanee salmon my family and I have caught over the years...none in Colorado though. Caught them trolling and jigging (jigging for them on both open water and through the ice). Maribou jigs work at times, but I've done better jigging Swedish pimples and stingers, orange dominates the show but have done good on green and chartreus. Trolling, we use orange, chartreus, green, and cerise martens, which you cant buy anymore. Dad and I probably have a couple hundred of them, swept up every one we could find in Montana, Oregon, Washington, and Idaho years ago. I haven't seen any for sale in at least 20 years, might try ebay? There are times that particular lure is the ONLY thing you can catch them on an I've seen times when one color and one color only works. We had a day fishing on Holter reservoir using green martins, that is the only thing they were hitting...and those salmon were all 20-24 inch footballs and fought like crazy. Sometimes we'd have 2-3 on at one time, which is common since kokanee are tight schooling fish. We caught so many we had to throw ice out of the cooler to get the lid closed. The larger males were at least 4 pounds some pushing 5. Have had OK luck with the luhr Jensen kokanee killers too, usually orange. Have also used Canadian wonders, not sure if you can get those anymore either, triple teasers, and dick nites also work. There is a half brass/half silver dick nite and Canadian wonder that we have had good luck on. But, usually the hot colors are best, pink, chartreus, cerise. You'll see people trolling with cowbells and flashers with wedding rings, etc. but that crap drags like an anvil and the fish don't fight for chit. We use lead core line with 30ish feet of mono leaders...usually 15 lb test from the lead core, tapering down to 8-10 lb test.
Another thing, is if its legal, white shoe peg corn on jigging spoons and your trolling lures is the chit. There are times they wont hit a bare lure at all. Attach one single piece of shoe peg corn on the bend of the hook (ONE, and only ONE piece) so you don't kill the action of the lure. This works well for trout as well. Never, ever leave home without a can of shoe peg corn if you're fishing kokanee.
If all else fails, be a copy cat...use what the locals are using. I learned long ago not to be stubborn, if I'm fishing and I see a guy knocking the crap out of the fish using an old boot for a lure...I'll find an old boot to tie on.
My experience and 2 cents...good luck.