The social and zoning policies made in 1935 were soon discarded; industrialization of the Yauza drainage basin continued unchecked through the Soviet period, particularly in the "reviled south-east quadrant" not obstructed by park and forest reserves. The territory immediately east and southeast of the Yauza became "the city's worst rust and smokestack belt". The "problem child of the first Five Year Plan" continued to grow until the economic collapse of early 1990s, and the river itself became "a reeking porridge of raw wastes from eighty-two manufacturing plants."