Washington State - missing one-degree square

[jackaphonic]

For some reason, my download of the Washington State Real Scenery (which is excellent) seems to be missing the one-degree latitude / longitude rectangle whose immediate neighbors are Mt. St. Helens to the west, Yakima to the east, Hood River to the north, and Central Cascades to the south. The missing rectangle has, at its SW corner, latitude 46 north, and longitude 122 west.

How can I get this missing piece of the Washington State scenery?

Many thanks,

Jack