the lewiston–clarkston metropolitan area—colloquially referred to as the lewiston–clarkston valley or lewis–clark valley (often abbreviated as lc valley), and officially known as the lewiston, id–wa metropolitan statistical area—is an metropolitan area comprising nez perce county, idaho and asotin county, washington. the metro is anchored by the cities of lewiston, idaho and clarkston, washington—named after meriwether lewis and william clark, respectively. as of the 2010 census, the msa had a population of 60,888 (though a july 1, 2011 estimate placed the population at 61,476), making it the 3rd smallest metropolitan area in the united states.