Rock Rapids is a city in Lyon County in the northwestern part of the U.S. state of Iowa, an area known for its strong Dutch heritage and conservative politics. It is the county seat of Lyon County and home to Central Lyon Schools. The population was 2,573 at the 2000 census. One of the highlights of Rock Rapids is Island Park, so named because part of the park is completely surrounded by the Rock River. Island Park features a Rock Island railroad trestle that has been resurfaced as part of a new recreation trail and a museum in the nearby retired depot. There are two small dams in the park, and one can drive across the river via a small bridge.