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In page Willamette Falls:

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The industrialization of the area led to diminishing salmon and steelhead runs, prompting the construction of a fish ladder in 1882. A new fish ladder, built in 1971, is currently operated by the Oregon Department of Fish and Wildlife. The estimated spring chinook salmon run for 2007 is 52,000.[10] The industrialization has also precluded public access to the base of the waterfall for well over a century, but as of 2017 a process to redevelop the Blue Heron Paper Mill site and provide public access to the area, including a river walk, is underway.