Richland is a city in Benton County in the southeastern part of the U.S. state of Washington, at the confluence of the Yakima and the Columbia Rivers. As of the 2000 census, the city population was 38.708. April 1, 2007 estimates from the Washington State Office of Financial Management put the city's population at 45,070. Along with the nearby cities of Pasco and Kennewick, Richland is one of the Tri-Cities of Washington, home to the Hanford nuclear site.
For centuries, the village of Chemna stood at the mouth of the current Yakima River. Today that village site is called Columbia Point. From this village the Wanapum, Yakama and Walla Walla Indians harvested the salmon runs entering the Yakima River. Captain William Clark of the Lewis and Clark Expedition visited the mouth of the Yakima River on October 17, 1805.