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

Turn right onto ID-16 N/Emmett Hwy

Continue to follow ID-16 N            13.9 mi

Turn right onto ID-52 E/S Washington Ave

Continue to follow ID-52 E              3.3 mi

Continue onto Van Deusen Rd/N Washington Rd

Continue to follow Van Deusen Rd 4.2 mi

Turn right onto Butte Rd 1.1 mi

Turn left                         6.3 mi

Turn left                         0.4 mi

From here, unless you have a Very Capable four wheel drive with great ground clearance, park here at the repeater site: 44.0112 -116.4060. Otherwise this road to this point is no problem for a passenger vehicle.

You'll hike on the road to the north, essentially following the it over the ridge and down to the saddle until it appears to bypass the summit - when you are about 4/10 of a mile away. You might choose to go cross-country sooner or try it on the way back, but it's a lot of side-hilling on steep terrain and not all that fun. I've attached my APRS routing in the photos below to give you an idea of how I got there. It's about 2.25 miles one way with about 500 feet of loss and gain through the saddle.

The summit proper is a collection of columnar basalt that you can use to help support an antenna and for a decent operating position. Don't underestimate the winds you might find here - they are a typically greeting in the Idaho mountains.