Northgate Canyon @ 500 CFS?
I'd call North Park Anglers and ask them. They always know the skinny on the canyon. Personally I'd be skeptical this early in the season. It might be flowing, but I'd guess it's not flowing all the way through the canyon, especially in the really shady spots. Gauge shows to be ice affected, so unless it's wrong I'd say it's still frozen. Check back in a month maybe.
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By the waterside I will lay my head.
Listen to the river sing sweet songs to rock my soul.