Note that there is another Idaho "Squaw Butte-W7I/SR-089" and that this "Squaw Butte" is also the name given to the long ridge just to the east of this two-pointer. However, the ridge and it's associated peak, "Squaw Butte South" doesn't have the required prominence for SOTA. But hey, the real peak is only a few miles away.
Directions to the "trailhead" seemed a little tricky for an out of towner - I've started them below from ID-44 - W State Street where you make the turn north on ID-16. See this for more information and other routes: www.summitpost.org/squaw-butte/275284