West Falls Church is a census-designated place (CDP) in Fairfax County, Virginia, United States.The population was 29,207 at the 2010 census. Before 2010, West Falls Church was officially named Jefferson.est Falls Church is a census-designated place (CDP) in Fairfax County, Virginia, United States. The population was 29,207 at the 2010 census.
Watershed at a Glance. The Cannon River watershed is located south of the Twin Cities and encompasses areas of Dakota, Goodhue, Le Sueur, Steele, Rice and Waseca counties. The watershed drains approximately 1,460 square miles through two main channels, the Cannon and Straight Rivers, to the Mississippi at Red Wing.
The Dalles was designated the county seat with the creation of the county, and has been its only location. The river traffic on the Columbia River was profoundly affected in 1935 by the building of Bonneville Dam in Multnomah County and by The Dalles Dam in 1957 in Wasco County (which submerged Celilo Falls).