Horsethief Butte Professional Review and Guide
"Despite the name of the butte, this is a peaceful preserve for recreationists to explore. Huge lupine and balsamroot flower displays are profuse throughout the spring, with white biscuit root, yellow bells, salt-and-pepper lomatium, and some type of wallflower species filling the carpet of color that spreads over the area. Still, all is not peaceful. There is death camas aplenty here, and tons of poison oak in the rocks of the butte. Be careful!
While this hike is short, you can combine it with other nearby hiking routes to round out a day. Or just take your time here. The well-signed trail climbs away from the shoulder of SR 14 near the outhouse. Immediately you are greeted with stunning views west to the Columbia River and the area around Horsethief Lake. Above you, the butte is spectacular."