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1841
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Construction of the Jason Lee House
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1841
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Construction of the Methodist Mission Parsonage
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1847
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Construction of the John D. Boon House by Oregon Trail travelers John D. and Martha Hawkins Boon
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1858
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Construction of Pleasant Grove Church
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1889
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Founding of the Thomas Kay Woolen Mill by Thomas Lister Kay
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1896-1925
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Construction of Kay, Woolen Mill, Salem
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1964
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Mission Mill Museum founded as a "museum and public meeting space as well as an educational, cultural, historical and activity-oriented center"
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10 Aug 1972
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John D. Boon House moved to the Willamette Heritage Center from original location near Boon's Treasury
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23 Apr 1973
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Jason Lee House added to National Register of Historic Places
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8 May 1973
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Kay, Woolen Mill, Salem added to National Register of Historic Places
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31 Dec 1974
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Methodist Mission Parsonage added to National Register of Historic Places
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17 Jan 1975
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John D. Boon House added to National Register of Historic Places
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10 Feb 1987
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Pleasant Grove Presbyterian Church added to National Register of Historic Places
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2010
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Mission Mill Museum and Marion County Historical Society merge to form the Willamette Heritage Center
