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from Wikipedia.org;

Between 1946 and 1948, the Addicks Reservoir was constructed by the United States Army Corps of Engineers to prevent a repetition of the sort of disastrous flooding that Houston experienced in 1935.[3] Bear Creek Pioneers Park occupies a portion of this reservoir. The park land had previously been occupied since the 1840s by mostly German immigrant farmers and their descendants. Harris County leased 2,154 acres (8.72 km2) of the reservoir in 1965 and began to develop the park.