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http://Oregon State Parks
This is about as close to Multnomah Falls as you can get without backwoods tent camping. The Ainsworth State Park campground is right off of the Historic Columbia River Highway at Horsetail Falls. In fact, you can even walk to the Horsetail Falls trailhead. Multnomah Falls is less than 10 minutes down the highway from Ainsworth State Park. Although the park is very much immersed in ture, the larger riverside town of Cascade Locks is just 18 minutes to the east, and Portland is just 25 minutes to the west.
This Historic Columbia River Highway campground is completely immersed in the tural beauty of the Columbia River Gorge. Guests are surrounded by the Columbia River Gorge’s lush, iconic pine tree forests, with magnificent waterfalls every few miles. In fact, the area surrounding this campground contains the world’s largest concentration of high waterfalls. Enjoy ample hiking and biking trails, take a swim in the cold waterfalls and creeks nearby, or hop on the Pacific Crest Trail for a few miles.