Drinking Horse Mountain is the prominent hill across from the popular “M” trail at the mouth of Bridger Canyon. The trail meanders along the Fish Technology Center to a bridge over Bridger Creek, followed by the official trail arch. After that comes a trail junction; either way is straight up to the summit, offering 360-degree views. Going left at the junction puts hikers on a steeper ascent, with multiple switchbacks and plentiful shade. To the right, the trail is less steep and takes longer to ascend; most of this route lacks shade along the west-facing side of the hill. Beautiful views of the Bridger range and Gallatin Valley greet you at the top.