Spirit Mountain Casino, Grand Ronde:
Read reviews in English Go back. The best casino in Oregon. TripAdvisor LLC is not responsible for content on external web sites. Disappointed that every machine ate our money so fast. The Northwests Premier Entertainment Destination.The Northwests Premier Entertainment Destination. Spirit Mountain Casino is Oregon's largest casino operated by The Confederated Tribes of Grand Ronde. Spirit Mountain Casino, Grand Ronde, OR. 98K likes. Welcome to Oregon's number one tourist attraction! Only 65 miles SW of Portland and only 25 minutes. Spirit Mountain Casino has started an elaborate remodeling project that of The Peak gaming area into Oregon's first non-smoking full casino.