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The South Fork South Platte River is a tributary of the South Platte River, approximately 45 miles (72 km) long, in central Colorado in the United States. It is located near the headwaters of the South Platte in Park County, Colorado and drains part of the intermontane grassland basin of South Park. It forms the South Platte by its confluence with the Middle Fork South Platte River in southern South Park.