Coordinates: 41°45′36.1″N 72°39′52.7″W / 41.760028°N 72.664639°W
The Park River, sometimes called the Hog River, since 1949 has been a subterranean urban river that flows through and under the city of Hartford, Connecticut. The 2.3-mile (3.7 km) river was buried by the Army Corps of Engineers, to prevent the spring floods regularly caused by increased surface runoff from urban development.
Before European settlement, the Suckiaug people (their name derived from the word sucki-auke, meaning "black earth") lived on the fertile banks of the Connecticut and Park rivers. In 1633, fur traders from the Dutch West India Company set up Fort Goede Hoop at the rivers' confluence. The Dutch referred to today's Connecticut River as the "Great River", and called its tributary, the Park, the "Little River".
The first English settlers arrived in the area in 1635; the following year, the Reverend Thomas Hooker led 100 of his congregation to form a new settlement north of the Dutch fort. The first mill in the settlement was built on the Little River by Matthew Allyn to grind local corn. During industrialization, the Little River became known as Mill River because of the numerous mills built to use its water power.