Idavada, a portmanteau of Idaho & Nevada, is an historical locale in Twin Falls County, Idaho. It is home to the Idavada Volcanics formation of silicic rocks. The nearest major highway is U.S. Route 93, and the nearest established settlement is Jackpot, Nevada. References Reference on "USA Historical Sites" Article on Futility Closet Article on the Snake River Plain Geography of Twin Falls County, Idaho