Horse & Cattle Creek Trailhead, located inside the private campground at Annet's Mono Village.Robinson Creek crossing.Upper Twin Lake.After several switchbacks, the trail follows Horse Creek.View back.View back.Horse Creek Peak visible ahead.The trail disappears as it crosses a moraine.Aiming for the notch on the right. (Horse Creek Saddle lies farther up the canyon, opposite a cavity created by glacial recession.)View back down the moraine.Class 2.Approaching the notch.From the notch, turning right toward Matterhorn Peak.Slogging up Matterhorn Peak's sandy southeast slope.View back toward Horse Creek Pass.Veering left into a notch.View back.Contouring south toward a Class 2 weakness.Class 2 weakness.View along the south ridge toward Matterhorn Pass and Whorl Mountain.Short traverse to the summit.Matterhorn Peak summit. View northwest along Sawtooth Ridge.View east toward Horse Creek Pass.View southwest.View south along Spiller Canyon. In the distance is Mount Conness.