Are you speaking of "summer Chinook season" as calendar season of fish stock season? I would suspect that the June season would more likely have to deal with adult White River Spring Chinook and they would have different H/W ratios and different conservation concerns. The later season would be at the "Fall" Chinook with a stronger hatchery component. Also possible that there is concern for the Chinook released from hatcheries, especially any yearling production (primarily Springers) that might be a short-term issue with sub-legal encounters as the aggressively feed.