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Cascade Tunnel East Portal Put-In is a whitewater access point on the Nason Creek in Chelan County, Washington. Located near the east portal of the historic Cascade Tunnel, this put-in provides river access for paddlers looking to run whitewater sections of the Nason. The site's proximity to the tunnel structure indicates this is a technical whitewater area that likely requires intermediate to advanced paddling skills. Paddlers should be familiar with reading whitewater and understanding local hazards before attempting this section.