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Lac Qui Parle lake divides the two counties. The park includes land on the southern portion of the lake above the dam on both the east and west banks, although very thin tracts on the east side in some places. The majority of the park on the east side is the campground. The historical site is also on the east side. I'm not aware of historic sites on the west side, besides where I caught that big walleye that one time. So I guess the historical site is Chippewa county.
I have split Lac qui Parle Mission into its own article. It is not in fact within the boundaries of Lac qui Parle State Park. The mission had been a separate state park unit, Chippewa Mission State Memorial Wayside, but was transferred to the Minnesota Historical Society in 1973. (Source: Everyone's County Estate by Roy W. Meyer) -McGhiever (talk) 01:31, 30 September 2012 (UTC)