These buildings are what are left of a small resort on the shores of Soap Lake, I have been told by some old timers of the are that it was the nudist colony. I can't find any information to substantiate this but it sounds more fun that just an old run down resort..
At one time Soap Lake was world renowned for it's healing powers, when the possibility of testing it came around it was found to have 17 minerals, these coming from the glaciers and lava rock that form this dry arid area.
Soap Lake got it's name from the fact that you could stand in the lake and with only the water from the lake actually work up a lather on your skin. Also when the wind would blow it would cause soap like bubbles to form on the lakes shoreline. Soap Lake is what is known as a soft mineral lake because its most abundant mineral is what housewives know as washing soda, rather than the calcium salts which are the main mineral in hard mineral water.
In it's heyday it was the place to go for all sorts of ailments. From the many testimonials of those it has helped, there is no doubt that the water of Soap Lake has curative powers. It is the only known successful treatment for the rare Buergers Disease (Thromboangitis Obliterans). Men using the water have been able to arrest or slow the ravages of the disease. Skin, circulatory, digestive, and joint problems seem to be the disorders most commonly benefited by drinking and bathing in the water. Another unique quality of the lake is that it is meromictic. The water is stratified into layers that do not mix with each other. The layer of water near the bottom of the lake is supersaturated with the healing minerals.
If you are interested in further information on the history of Soap Lake a good site to go to is