Grand Coulee Dam is the largest power plant in the US. Originally it created significant power to run the (WW II) war effort in this part of the country. In the 1950s it was adapted to also be a large source of irrigation for the area.
Mercer Island is an upscale city, and island, located in Lake Washington between Seattle and Bellevue. We spent more nights here, four, than any other stop on this road trip because we had so many family and friends we wanted to see.