Pikes Peak State Park is a state park in Clayton County, Iowa, United States, featuring a 500-foot bluff overlooking the Upper Mississippi River opposite the confluence of the Wisconsin River. The park is operated by the Iowa Department of Natural Resources. It is nearly a thousand acres in extent. The nearest city is McGregor, Iowa. Iowa Highway 76 approxi…Pikes Peak State Park is a state park in Clayton County, Iowa, United States, featuring a 500-foot bluff overlooking the Upper Mississippi River opposite the confluence of the Wisconsin River. The park is operated by the Iowa Department of Natural Resources. It is nearly a thousand acres in extent. The nearest city is McGregor, Iowa. Iowa Highway 76 approximately defines its northern boundary.