I grew up out in Guymon and watched all the creeks, river beds, and even lake Optima go dry. You can drive over a lot of bridges in that part of the country that have no water under them anymore. Scary stuff.
Unfortunately Optima has a hole in the bottom (actually I think it's some sort of geological fault) which allows water to drain out. I think it resurfaces in the river below the dam. It's an eternal embarrassment to the Corps of Engineers, and will never be a viable lake.