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I seriously doubt that Weyerhaeuser will be open by October 6th. It would take a lot of rain for that to happen, and it's not in the forecast. You are lucky that Weyerhaeuser is allowing access to the state land. That will be your best bet.
The gates being closed really means nothing. You have to call and listen to the message to find out whether their land is open for public access or not. When it's open for access, even an open gate doesn't necessarily mean you can drive in.